Mtn connection cut without reason

Mtn discontinued my services today without reason or prior warning. My account payment is up to date, and since a debit order goes through at the beginning of a new month, cutting my lines on the 29th makes no sense. So one has to leave your business, travel all the way to an MTN store, stand in a queue and wait till they tell you they can't understand it either, and reconnect you. And seeing rhat my husband is linked on the same contract, that means that he had been cut off as well. We rely on our phones for business, and this is totally unacceptable.