CONSISTENT BAD SERVICE FROM MTN

MTN's service will never change, same horrible service that resulted in me porting my main number to CellC 3 years ago is still as bad. I changed my debit order date and got a confirmation email on the 26th of June that everthing was in order. 20th of July MTN still debited my account despite the confirmation received from them. MTN said this is becuase on their side the changes were made on the 18th of July(who's problem is this). When I queried the bank charges I got charged as their liability they said on their side there is no bounced debit order and therefore they are not liable for any bank charges. Today I get an sms that my son's services have been suspended due to non-payment . It seems like the agents are so *********** that they cant even read the system and tell me what the way forward to sort my issues out. When I call the customer service they have network issues. I have requested for a callback countless times and all i get are emails. Tamara Mthandazo, Melissa Jaarsveld, Mogamat Davids, Nosithembele Nabo, Matilda Dlamini, can so many people all be so *********** to just pick up the phone and call me to resolve this long outstanding query. MTN did nt change my debit order when they supposed to despite sending me confirmation that this was done on the 26th of June. This is not my fault and therefore you need to refund me the bank charges if you say my debit order bounced. If not, why am i being penalised for something that was not done on your side, why was my account debited on the 20th? Also, if you the debit order was successful why is the service suspended. What exactly is the situation with this account. Stop being so *********** and do what you are paid to do for once in your lives.