Hidden Agenda

I had a 24 month home data contract with MTN. the contract expired on the 26/04/2022. I paid R399.00 per month for the 24 months. When i cancelled the contract i was slapped with a bil of R1000.00! I am told that once the contract is up my discount falls away and I pay normal rates!! MTN SA did not tell me this when i cancelled the contract nor did they tell me this when i signed up. A bunch of *******!! I will not be paying the R1000.00. MTN will never have my business again:(