Bad customer service

The worst customer service ever. Made payment with wrong reference number - .end of April. No amount of phonecalls, emails and begging could resolve the matter. They promise to sort out, to phone back and even gave me a Vodacom contractor e-mail - just this deafening silence. Suppose we can expect this when you are just a number. Every month I get the warning sms. They are persistant to recover the full amount via debit order, which I refuse to happen.