MTN - No service

I was previously with Altech Autopage (MTN) and this was switched to MTN in March 2016. I upgrated my phone in December and as I was on 20 months I had to pay a new handset fee of R170 until 10 April when my new contract was supposed to kick in. The new contract never kicked in as was supposed to happen. I have been phoning and have been promised to have my calls returned which has not happened. I logged my complaint with Reference No *** on 20/4/2016. I was told it would take 48 hours to resolve and I would get an SMS. I am still waiting for this. I phoned to follow up on 3/5/2015 and was told the matter will be escalated to a team leader and someone by the name of Nonhlannhla who I spoke to promised to call me back personally on 3/5/2016. I am still waiting for this call. Today *** I called again and was attended to by Mondi who advised that the system for the escalations was down and that I should call back in an hour. When I said this was unacceptable that I should be doing all the calling to correct a contract, I was informed that the Teamleader Kididona Mkwha**** would call be back. I told Mondi that if this call was not received within the hour, I was pasting to hello peter hence my doing just that. I have defended MTN at every corner as I have had nothing but good service but I have now discovered that the good service was actually Autopage and not MTN. I am very dissapointed and need this matter resolved urgently. As matters stand now I am being charged for an old contract and a device fee which I am not liable for anymore in terms of my new contract which should have kicked in on 10/4/2016. I have since spoken to Mpho yesterday and I have now been referred to Amanda Aladi at the upgrades Department on Tel *** which is impossible to get through to as nobody picks up the phone.