Poor service from DMC.

I'very never experienced such bad serice from this company. To cut the long story short,

I have an account with a service provider (cellphone contract) that was handed over to 2 different debt collector which DMC is one of them. So basically i have the same account with 2 different debt collectors. I had called DMC to do research since I've realized i'm paying for 2 collector for the same account..i spoke to the lady and she advised me to check who started debating first of which i found out DMC is not the first to debit me so this means i should collect statements from the other collector to serve as proof that DMC were second to debit. So i collected the statements and sent to DMC to a lady called Sebeko Motumi (poor service from that one too) i was told that my query for a refund will take up to 14 working days to receive feedback which i did not receive. Yesterday i called again only to get someone who is worse by the name of Siphosethu Faku he couldn't understand my frustration that I've been waiting for feed back no one called, sms or emailed me. Being livid is an understatement. I need my refund even worse the debited me again yesterday so it's a total of R5000 which i need so badly. These guys are very undermining to say the least. Since i'm the other debt collect this means I've paid R10,000. Siphosethu said he'll escalate my query of which he then said he doesn't know the turnaround time. Guys my advise to you is becareful of these ****mers who say they are here to help you but i had given everything they need from me. I'm so upset i need clarity from the supervisor/manager.