Exceeded my lowest expectation

I recently had a dispute over a contract that I was recently sold, their interpretation of the call when I was sold the contract is completely different to my understanding so the dispute was deemed invalid by them. Not sure how they say it’s invalid when you phone in for one thing and then get sold something completely different that is going to prove to be more costly in data that the original plan. So disappointed that I am stuck with them for two years. Never again