Mondo aftersale service is a huge dissapointment.

I was sold a dream by mondo. After service you are asked to stay on line to rate the service...so i did and gave a wonderful rating. But non of the promises in the phone call realized. I am a MTN customer and was due for an upgrade. Mondo called me and we closed a deal. I was not satisfied with the phone so i returned it in the stipulated tine. Im paying for a cell phone that i returned in October. Every month the money deducts. No answer on phone calls. Holding for more than 10 minutes without any operator answering a phone. I am really unhappy about the after sales service given by mondo. MTN also is of no help in this matter.