SIM Card discontinued but data still being charged

We have moved from Axxess to Afrihost because Axxess client service is non-existent. 2 of the data cards that we tried to move across, did not work. Since Afrihost charges R200 (ridiculous) to courier a new data card to their clients, they suggested I purchase an MTN SIM card and then transfer it across - which I duly did. This SIM card was provisioned for data services only and was used as such, with a monthly automatic recharge of 1GB. For the past week or so, we noticed that the SIM was disconnected from the network and could not be used. I contacted Afrihost and the first agent told me to try the SIM in another device, then she would call me back (she didn't). So I requested another call and after explaining the problem (again) the agent informed me that the number of SIM card was probably made dormant by MTN and given to somebody else because no calls were made via that number. And the more I am trying to get some accountability that Afrihost takes my money but allows the number to expire, the more the (rather impatient) agent tells me to just get a new SIM card and move it over to Afrihost again. Honestly, they can wait until doomsday come that I ever get a service through Afrihost again. The knowledge of the agents suck (from the beginning I struggled to get existing numbers provisioned, that is why I eventually got a SIM card in an MTN shop) and their accountability to their clients is non-existent. I still have one data card through Afrihost but as soon as I have found and alternative provider I will move away. I guess cheap price gets you cheap service.