Debited for over 10 months; still unable to get answers.

I have been having issues with Yellodata since January 2017 when the data they loaded on my phone suddenly stopped. After several calls to the customer care for assistance; I sent an e-mail in June 2017 and was informed that my account was suspended due to failed debits. I then sent my bank statement on 31/08/2017 which showed debits from Feb 2017 - Aug. 2017. On the 29the September; I was told that the matter has been escalated to the relevant department and that I will be refunded what was debited. Fast forward to today (11/01/2018); the Customer Care Consultant has informed me that they are still waiting for the Billing department to get back to them.

Surely it can't take more than a month to correct the wrongs within your business... I feel that customers are not being taken seriously here. this is the worst service ever!!!!