Double deduction of debit order

The company, Mfene Telecomms, made a double deduction on stop order. They then claimed that it was payfast who made the error. They proceed to claim that payfast paid back the amount incorrectly deducted, whereas such a refund never occurred. I was told by Mfene that it is up to me to speak to payfast regarding the ‘refund’ that never occurred. The public should be warned against the way that this company is distancing themselves from any blame for double deductions which could only have been instructed by Mfene Telecomms.