Please be aware that you are not communicating with Apple when you post in these forums. Most of the people who will reply to your posts are, like me, your fellow users.
As to your issue, you had 30 days from the time you downloaded the rental, and 24 hours (US)/48 hours (rest of the world) after you first begin watching to complete watching the film. If you did not watch the film within those times, then the film has expired. If you still want to watch the film, you'll have to pay to rent it again, just as you would with any other item you rent that has reached its due date. If, however, the film disappeared before 30 days had elapsed, or before 24/48 hours after you began watching, go here:
and follow the instructions to report the issue to the iTunes Store.
As to your problem with your iPad, I'd suggest you take that up in the iPad forum. Be sure to include all the specifics so people have information on which to base a diagnosis and suggestions.
Most of the people on these forums, including myself, are fellow users - you're not talking to Apple or iTunes Support here.
When did you rent the film and did you start watching it ? Rentals last for 30 days from when you rent them before they expire, though once you start watching them you have 24 hours if you are in the US, 48 hours elsewhere, before they expire. If you didn't watch any part of the film and it disappeared within the 30 days then you can try contacting iTunes Support : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption
For the iPad going slow and apps abending have you tried the standard troubleshooting e.g. closing apps via the iPad's taskbar, a soft-reset, if Safari os abending then clearing its cache and cookies via Settings > Safari, backing up and restoring the iPad ?
Lol i thought i was asking some one that worked for apple.
That help I guess because it was about a month ago I rented the film but was unaware you only had a 30 days to watch it, a warning would of bin nice. Now the film is no longer available for rental only for purchase. I don't want to watch it that bad, enough to pay 10£ on top the 4£ rental charge.
And for the iPad going slow I closed all apps and cleared cookies and stuff and reset it. Does it not back up automatic when on wifi cos have not backed it up on laptop cos don't really use laptop because thats is even slower. Do u think that would help speed it up, does only having 1.4 gb free affect the speed.
If you have Settings > iCloud > Storage & Backup > iCloud Backup 'on' then it should backup automatically when it's on wifi and plugged in - that screen also has a 'Back Up Now' button so that you can force a backup. And from that screen you can select Manage Storage > select the iPad and you can select what gets backed up.
Note that some items aren't backed up to iCloud e.g. you can re-download music, films, tv shows depending upon what country that you are in and whether they remain in the store (apps and ibooks can be re-downloaded everywhere, as long as they remain in the store) ; audiobooks and ringtones are currently a one-time only download from the store.
Having 1.4 gig free shouldn't make much difference.
Are you closing apps via the taskbar : from the home screen (i.e. not with an app 'open' on-screen) double-click the home button to bring up the taskbar at the bottom of the screen, then press and hold any of the apps on the taskbar for a couple of seconds or so until they start shaking, then press the '-' in the top left of each app to close it, and touch any part of the screen above the taskbar so as to stop the shaking and close the taskbar. That might (or might not) help