Worse Service and complaints dealing department

I took a data contract with MTN paying 250,however in March a consultant called to let me know that the contract is expiring and that he would like to sell me a new product.I told him that i dont work and would actually like to reduce the money on my current plan and if he could put me on a lower paying plan from 270 per month to 200 per month.He adviced that he did and that from then going forward i will be paying 200 istead of 270.The data was used as normal and even run out before month end.End of the moth i received a an invoice saying i owe R1430 regardless of me expressing that i wanted it to be reduced and capped at 200per month.When i calld i was told that i was put on unlimited and when i asked for the recording .MTN is giving me the run around and trys to get me to agree to a payment plan .In April the invoice was increased again although they disabled the data usage after not paying end of March .how am i still being changed further for a disabled plan,this is unfair treament of customers and taking advantaged of the unemployed people. I would like for MTN to send voice recordings of me agreeing to this plan as i explicitly told the consult my preference. My email *** ,number ***