Refusal to refund me an give me a paid up letter

I paid off my account on the 6th of August this year. on the 23rd I was billed again when I brought this to their attention they said they will refund me and give me a paid up letter. to date none of the two has occurred and when I call and ask what is happening they are transferring me department to department. this is the last opportunity I will give you to respond and give me answers otherwise I am brining this matter to the National Credit Regulators attention on Monday . this type of non- performance on your part is not professional. <br> <br> Regards <br> Kgadi Matlala