Extremely bad service and communication

On the 15th of October 2022 I moved premises from Waterfall to Chatsworth. I was told that because the contract was still active, I had to pay a fee of R1300 to remove and reinstall my security system. After scrutinizing my bill for October I noticed that I was charged R1000 extra. I immediately contacted the sales manager Brooke who said that she was sorry and that it was her mistake. She agreed that the amount on the statement was exhorbant and that the outstanding amount would be staggered into six installments. I accepted the additional fee of R1000 as I understood that anyone could have made a mistake. In January 2023 I was billed an amount of R1500 and after quering this with Desiree Pillay I was told that there was nothing she could do as I owed her the money. This lady was very rude over the phone. I have previously reviewed this company give it 5 stars but now have to say that their administration section doesn't even deserve 1.Blu has not honoured their arrangement regarding their mistake and during these trying times it's hard for an amount of R1500 to be deducted from your account instead of R300. If this is going to continue to be the case then Blue can have their security system removed from my premises and lose a customer.