Contract expired

I am really not impressed with MTN and their service. My contract expired in March I called them on the 08th 0f May to have my number converted to prepaid. I was told by Khosi to wait for 3- 5 working day of which I did. I then called on the 19th the lady I spoke to she said the waiting period is actually 14 working days. Today I called them I spoke to Tebogo Nkuatsane who advised me that she has escalated the query but she is not sure as to when the query will be attended to because of the strike and I will be liable for June invoice again of which I fill is unfair because I did my part I called in and they are the ones who are giving me a run around. It is really funny that come debit order time they are there to process the debit order but we do not get the assistance we need.