Terrible consistent experiences

Ive honestly had the worst experience with Mtn lately.My mom,myself&sisters accounts are all debited from one bank account. Over the past couple of months there's been incidences where at least 2 of our contract phones are suspend by mistake. &everytime we have to mission to find phones to call Mtn&query and WAIT 24hrs for our phones to be unsuspended. It's happened about 3 times in the past 5 months. All times by mtn system error.I upgraded a month ago i asked that all phones be debited from my account so we changed bank details&also requested that the date of the debit order be changed. They said all this will proceed as of November.The date of the requested debit order came&left&nothing was debited.To our shock, the amount was debited out of the PREVIoUS account that the phones were under&on the PREVIOUSLY arranged date. So everything happened as if no details were changed. THEN i wake up this morning to realise that ANOTHER debit order came out of my account which luckily was rejected by my bank. What kind of ******* and inconvenience is this? Im highly disappointed.My mom went in to query&was told it was a system error???