The worst customer service I've ever experienced

The worst customer service I've ever experienced. I made a payment of R1200 at the end of November and received a notice of suspension 2 days later for my monthly installment of R699. Of course I cannot afford to pay R699 on TOP of what I've already spent this month and NO one is willing to assist at ALL. I've spent the last week speaking to multiple agents - all of them have been blatantly and unwilling to assist in any way. I apparently have a designated credit controller or debtors person who was previously assigned to me yet on numerous occasions fail to respond to my emails and fail to call me back when I'm promised a call back. The level of service is putrid. And the fact that no one can assist with setting up a payment arrangement is ridiculous.