icloud data back up delete issue

Hi! I've recently bought an iphone5 and have restored it from icloud.

The problem I have now is that i cannot delete the back up data.

I have 3 back up data showing

(1) My old iphone

(2) My new iphone

(3) My ipad.

I can delete items 2 and 3 and not (1) My old iphone data. I keep geting the message "cannot delete data as it'sin use".

I have tried everything from turning Wifi off, stoping icloud back ups, nothing sems to work!

Please help!!!!!