Mobile phone contracts

Why oh why do mobile phone contracts have to be so difficult to evaluate.

My contract is up for renewal, so far my provider has admitted to making several mistakes in the history he has pulled up making each quote he has given me next to useless. I make an enquiry about using a Blackberry and lo the cost is 5 times that given on a major providers website.

Is it so difficult to quote for five phones and a 3G broadband package, where I only want to replace 3 phones and have mobile email for two.

Now I need to do the call evaluations that I thought my supplier was doing, to ensure he has done it properly.

Phones I have been looking at range from my Nokia E61 replacement the E71, the Samsung Omnia, Blackberry Curve and a Nokia E66/6220.