Rain with horrible and unfair service

Rain has such horrible client service even after I have left them , I had a subscription which I cancelled owing R1500, I have been calling Rain to make an arrangement to pay this money but looks like they're playing hide and seek with me. The last time I called was last week, I was made to hold for 20 minutes until my airtime ran out. I don't know what's so hard about making an arrangement or they enjoy ruining people's names.