Fed up customer

I’ve had endless issues on my account since MTN upgraded their systems from non-payment, invoice dates changed, my account was suspended twice already and only opened when I emailed the proof of payment. I’ve been paying this account the same way for almost 3 years and now it is a problem. Every time I contact the customer service something else goes wrong. I was informed the reason for the issues is because I pay my account using EFT and it was suggested to pay via debit order which I did and then the debit order went off on the wrong date, who will be held liable for the charges on my bank account and not to mention the my credit rating with the return of debit orders.

I feel this is so unprofessional and very disrespectful that this issue cannot be sorted out and nobody can get it right at MTN.