Double payment - Urgent feedback please

I have a loan with RCS, the debit order went through on the 7th of March 2018. On the 12th of March I received a sms stating that no payment was received, I phoned them on the 13th of March and the person on the other end said that it shows on their system that no payment was received and I should pay the money into their account. I asked him if they will pay back the money as soon as possible as soon as they receive the original payment, he said yes. Ever since I am battling to get hold of them to check the status of the payment. Being on hold for more than 15 minutes until my airtime is finished. I logged a call on their website for them to call me urgently but with no avail. Again this morning I called but was again placed on hold until my airtime ran out. I urgently need feedback on this matter! The amount I had to pay in was R590, meaning for March only they received R1180 from me, a double payment. If I can get feedback asap I will be relieved. Regards, Shaun