Upgrade disaster

I upgraded a contract ,it was coming with 2 phone then they gave me another Sim card only to find out that they did not upgrade the contract instead they issued me a new contract and they are still billing the old contract . I called the company they are telling me there is nothing they can do the minutes and data which I was suppose to receive with the upgrade it's being billed but I am not receiving them . kindly assist please all the 5 service champions I spoke to did not manage to assist