On Air daily *******

I have an issue with On Air Dstv several since i have a DSTV explora with them they have been deducting since but April got a call from them that i'm owing three which i did not understand but i let them deduct more money which was close to 938 and all was fine when i went back to check my history of payment i find out that i never miss any payment from them at. but i kept Quiet today i just received a message stating that im owing 537 for what because they have been deducting from me its better they come and take this i dont want it again will stop my debit order these people are robbing me. ***** people they must come take this decoder i dont want it i will rather find a better one and reliable company than them.