Poor customer services

I started debt review with debt busters in October and my first payment I made via bank transfer of R3900 and come month end November I get an sms saying the debit order amount will be R6282, tried sending email to understand why such an amount and no one responded to my emails, and on the 26th I managed to speak with Lungile Velemini and when he investigated, he told me it's system error and I will get a refund back of extra amount debited after 48hrs, now it's 2nd December and is more than 48hrs and still nothing, I've send him an email and tried calling. He is not responding. The customer service with this Debt Buster is very poor.