Bad Customer Service from MTN Airfibre

I have been using MTN Airfibre for two months. Due to other commitments, I arranged with them to deduct their payment on the 28th of this month, while keeping my internet service active. They agreed to this arrangement and even sent me an SMS reminder to pay as scheduled.

However, they suddenly suspended my internet service despite the agreement. I then had to make an urgent plan to pay in order to restore the service.