Debiting money not agreed

I took a package with DStv in May and paid, in June they double billed me taking advantage that it’s a debit order agreement they debited R700 instead of R590 I reversed it this month they debited 960 like they are ****mers hence that’s why they are loosing customers I’m done with Dstv do not make any debit order agreement with this people now they say it the the problem their side they failed to communicate. We are talking about money here