MTN - NO ACCOUNTABILITY

Months ago I learnt that My debit order was not going through to MTN so I called them and they advised me that I was owing htem an ammount cause they were not receiving payments . I dont regually check my statements so anyways I asked them why they did not inform me and they said they sent SMS to the MTN NUMBER , I advised them that they had my other contact details as well....email , my main cell number and work number . They gave me an excuse and cut the call so I posted on hello peter and still no one contacted me....a few weeks later I posted again on hellow peter and this time a manager called me according to the person.....she basically gave me a story and I gave mine and she gave me banking details ...I made a payment of around R1100 and specifically asked for my debot order to be instated ...this was not done and now I get a letter from their sherriff department demanding almost R5000 or ELSE!!! They have also listed me . Its amazing how MTN does not take responsibility for their actions and provide customer service the way its supposed to be provided , I have been with them for over 10 years and never defaulted in my past contracts , Thanks for reuining my life.