received an email saying i purchase an app route 66 navigate and will be charged £32.99 did not purchase this

What sort of a message? If this was an email and was not addressed to you by name then it's a scam - there is probably a link for you to cancel the purchase which if you hover your mouse over it you will see it's not to an Apple URL: do not follow up any such links, ever.

If you want to check your purchases, do so directly in the iTunes Store.

Instructions here > How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase

Then change your Apple ID password > Change your Apple ID password - Apple Support