Don't use Mondo, EVER

A few months ago a Mondo agent contacted me (I was under the impression it was from MTN as I have a contract with them) with an offer to upgrade my data plan. I agreed to such as it was at a low extra rate, and it was supposed to be anytime data. Once I received my data and my first debit went off, I noticed that this was not the product advertised to me, nor was it the amount I was required to pay. Instead, they overcharged me. I lodged a complaint with Mondo, and after months an agent contacted me to inform me that the dispute had been in my favor and that someone will contact me to set things right. This was about 5 months ago. I have since been trying to contact them to no avail. Either my call gets dropped or the calls don't go through. Unfortunately, my credit score has gone bad due to my debit order being much higher than agreed to and I am unable to pay the amount they requested. The amount keeps increasing, the data is useless and no one can help me. I have read numerous comments and reviews on their page, they seem to be the largest organised ******** I have ever seen. HUNDREDS of people are being ****med by them. No one is receiving their products. Some have been waiting years. Mondo needs to be stopped. I am going into debt and messing up my credit score trying to pay the **** they decided to put on my account. What can I do? I can't even afford my monthly expenses anymore.