MTN bad service.

I got a R465 monthly deal for home Wi-Fi 20mb up and download uncapped. Basically, a prepaid home Wi-Fi. At first, I had a bank debit order in place but there were some issues with that, so I paid cash at a MTN store. They said that my billing date was the 22nd of each month which I on numerous occasions phoned 083136 and even went to the MTN store to say that my debit order used to go off at the 1st of each due to my salary being paid in the last working day of every month, and that I do not have the finances at the 22nd of the month to pay. The customer care operator 083136 and the staff at the MTN stores assured me that they have corrected it on the system and that I can make payment on the 1st of every month. Now my Wi-Fi is off, after I paid and their latest story is that cash paying customers must pay on the 22nd of each month or else their service is disconnected. NO one up to now has ever told me anything about the above-mentioned concerning cash paying customers. I am staying on a farm with a remote location, and I rely heavily on my Wi-Fi for communication purposes. When I first app**** for the Router, MTN asked for my location to determine if there was coverage. MTN confirmed I have, and we proceeded with the application, I have never had 20mb at any stage, but I was at least connected. MTN with misguided information and NO help whatso ever gets a zero rating from me. Kind Regards, Dricus