Horrible customer service

On the first of 1 June 2021, I was billed two amounts, one of the amounts was correct and the other was incorrect and was charged on a separate account. I immediately contacted rain with the matter and they said it was a billing issue and the matter will be escalated to the billing department. I subsequently called every other day to follow up on the matter but on each call, the matter was being escalated to the billing department. After a week the matter had still not moved and no one could give me an answer regarding my issue. I have even lodged an ISPA complaint cause this is unacceptable and the worst service I have ever experienced