O2 Simplicity for BlackBerry- price differences online/instore?

Hello

I had been intending to buy a Blackberry Curve and getting it unlocked and putting my own SIM card in due to several reasons as I wanted to keep my own number as I am currently on O2 Pay and Go.

On the website the Simplicity for BlackBerry 12 month contract for 300 minutes, unlimited texts and inclusive BlackBerry service for £10 or £15 for a 30 day rolling contract. http://shop.o2.co.uk/tariffs/simplicity/12_months

Anyway I'm one of those silly people who is scared of buying things online and I went instore and I was informed by the member of staff I spoke to that it was not £10 but was actually £17.50, an extra £7.50 for the BlackBerry unlimited bolt on. I told her what I had seen on the website and she denied it and claimed not know anything about it and said if I had seen it online at that price that it was probably an online deal only.

So I guess the purpose of this post is if anyone knows if I can buy the Simplicity for BlackBerry contract at the price stated on the website from the O2 shop itself?

Any replies will be greatly appreciated.

Thanks.