Upgrade Con

Beware of being taken in by a salesperson who contacted me for an Upgrade, the package offered did not suit my needs and I was promised that because I have been a customer for over 20 years he would change the upgrade offered so that I may get more free minutes as the 30 minutes offered was useless to me, he assured me that it had been done and I agreed with the new offer, however when the new contract started 1 Novemeber there was no change, I have phoned Cell C customer service 5 times and get fobbed off by being given a query and was promised I would receive a call from Cell C to sort out the problem, to no avail, I have sent e mails and also no response, How can it be allowed that an agent can get away with this just to make a sale? Once my contract is up I will be changing to another service provider, AND will not recommend Cell C because of this bad experience.