Bad srvice

I have been using cell C for more than 20 years but think now it is time to leave this service provider. I upgraded and opted for debit order payment. To date I accepted 5x Debi check. I received 2 calls , one agent was rude and the other one confirmed the mistake is from their side because it is recorded as cash payment. She promised to escalate to her manager to sort the mess. Now I receive a message my account is suspended with credit bureau adverse finding

*** Attachments Tue, 28 Nov, 15:18 to STOKANA.MAHAPA

Dear valued customer • FNB:-) You accepted changes to CELL C SP DebiCheck debit order. For queries contact your service provider. FNB, a Div of FRB L