MTN Home Internet, Billing & Debit order

My debit orders don’t go through as per given date. I’m debited on any random day and never debited on the date agreed, which forced me to go to store and pay my debit to avoid arrears (I mean what’s the whole point of debit order when you guys can’t debit on time and I’m forced to go to store and pay?). I’m also always invoiced incorrect amounts too. I’ve been referred to countless and different agents via customer care and getting new reference numbers everyday. My account is currently under arrears because according to them I’ve ‘binged’ a clause that says if my payments are late I’ll have to pay for router R2533 and due to that matter it’s been escalated because they have seen their fault and are aware that I’ve been going to the store to pay irregardless. I haven’t had access to internet since June too. I went to the store again and I was advised that I still can’t pay for other months until the issue is resolved which is an inconvenience to me from the billing and not having access to the internet. I want to cancel my contract but I can’t because I need to be cleared but the problem is that I’ve never received feedback regarding this issue till date, and they still sending me the same invoice each month. To sum it up, I’ve never known peace since I started my contract with MTN in May from the get go.