Okay.....got bored waiting for a reply, so, this is what I did and so far it has worked!
I deleted the App from my iPad 3 and downloaded the game again from "My Purchases". Upon start up it goes on to offer you the option to purchase the multi pack option again. Click on no. It then goes on to offer you "reload purchases"...click yes....bingo!
I'm currently downloading episode 2 and I'll probably have to start episode one again but hey, not too much of a hardship.
I hope this helps someone. Good luck!