I am not happy with how telkom has been treating me as their customer

I took a contract with Telkom of a data package which was said to be 40GB day and 40GB at night only for the packege to change when I go to collect the router it was now said to be 20GB day and 20GB night, I Iaunched a complaint and they Said they will help till today. Now my business had a bit of a problem I went to ask them to stop debiting on my account I will be paying in shop they said I must go to woolworths or pick n pay and I did as that only to find out wen I go the my statement will be times to 2 the charge I asked why they said you only allowed to be debited not pay in shops but I asked you guys are the ones who said I must pay in shop I still went on and submitted new banking details only to find out they not debiting but adding on my bill times 2 the amount now they have blocked my router but my account had money all along no debit went off tried calling their call center no answer what should I do?