Second complaint still no response

As a very long term client at MTN, I did not expect this level of service, or lack thereof. I upgraded my cell phone, in a reasonable time before hand to arrive at the right time.MTN, promised for it to be delivered as requested and to do a SIM swop with no problem. When the phone would arrive the SIM swop would occur and the upgraded contract will take effect. The new phone arrived a month late, after numerous calls to MTN which did not help at all and wasted airtime for me. While waiting for my new phone on the new contract, my then contract, which was intended to still be in effect up until the new contract takes effect when the SIM swop occurred, was suspended. The phone works perfectly, but for some unknown reason, MTN has decided to suspend my contract every month since. Now again, I am sitting with the same problem, went through the whole process, took the rude attitudes from the operators and just have had enough. I am over charged for the same service that was agreed upon on the contract, I pay promptly every month my fees, even though I am stuck with no service for more than a month. Taking the contract from MTN has given me more problems than I thought possible.