Poor service from MTN

I am very much discusted by the service of MTN. I have a contract for many years with them. I normally pay my account by EFT on the latest 29 th of each month as we get paid on this day. As February have only 28 day and we received money on 1st March, I paid my account on 1 March 2019. They then suspended my service. I gave them time to discover my payment and put me back on air .... but I had to phone customer service on 5 March 2019 to ask why my service in interrupted. The lady said she can't see why as she see the payment reflecting and that I only had to restart to phone to have my service restored .... with NO success. I visited the branch in Nelspruit (The Grove) only to be told they have system problems. They are quick to suspend but very pathetic in their service!!! After the contract mature I will move it over to Vodacom. I am sick of poor service from big companies!!