******** contract upgrade

I entered into a contract with Vodacom 2 years ago which I have been paying very well. The contract is supposed to end in July/August. I received a call around March or April from someone with the surname Ngwenya telling me he will upgrade it to getting R5 more airtime. In the call he did not explain that the contract was now starting another 2 years (I would have said no), he did not explain I will pay a huge fee to upgrade. I then called vodacom in May to complain. I was given a reference numbe rRef 1- ********** ********** and told it was a system mistake blah blah. I called vodacom now to sort the mess out because as far as Im concerned my contract ends this year. I spoke to Bongani who was able to see all my details but then transferred me to elitemobile because they will help me. They took all my details and they cannot find me on their system. VODACOM SORT THE MESS OUT! Your agent did not enter into a lawful contract with me for an upgrade so my contract ends soon! I will not call you again, you created the mess, sort it out