I'm not getting on with the terms of my Vodafone 24 month contract...?

[Braden]

i dont think you can cancel the free talk time with other vodafone users, sorry.

[Norma]

I got a Blackbery on Vodafone last month for 24 months at a rate of £40 per month. I have just entered the second month. I get unlimited internt access, 900 mins of calls and 900 texts, which is fine, the only problem is, which I didnt think about at the time, is that I also get free calls to all Vodafone users. Which sounds great, but not for me, as I simply can't use all my minutes, its impossible as almost everyone I know is on Vodafone. Can I either cancel the free Vodafone calls or change the contract?

Thanks in anticipation.
Well, basically because all the numbers I call at length, ie best friends and boyfriend, are Vodafone, so Im not beign charged because theyre the free ones, so the 900 minutes i have are not being used, and they do not roll over to the next month, so at the end of the month when it resets i have lost them and am paying £40 for nothing basically.