MTN service suck big time

MTN sucks big time they don't care about their customers. I paid my account for May, June and July and l have sent them the proof of payments but to my surprise am owing MTN for 3months. I have send them the proof of payments more than 20times and l get told the account department will sort this query. When you try to phone their customer service 135 there is no option of speaking to a consultant which l find it ridiculous because with such problems you need to speak to a human being. Every time l email MTN they take forever to reply my email and as always they ask for the proof of payments and l always email to them and they give me the same answer about the account department am so tired of this. I regret the day l chose MTN because cleary they care less about their customers. Their twitter is worse they take a week to reply to your message what company does this. I have requested their account department number so that l can talk to them and find out why my account is on eriairs when l have paid them am told to phone their stupid customer service number 135 which doesn't help at all. MTN your service is worse.