MANUAL PAYMENT DONE BUT STILL DEBIT ORDER RUNS

good day

i would like to complain about Telkom, i have mobile contract with them, sometimes they deduct via debit order sometime they don't, i have made payment on the 20/01/2020 and on the same date they run debit order i made reversal due to payment was already made manual, and then now i have to pay R202.70 for the reversal payment why because they did get their payment for that money and now again in Feb debit order did not run for Feb when am calling them they don't know why debit order did not run. now i have to pay R371.70 please help my ***