Payment arrangement made 3times and still listed at the credit bureau

I am very very very livid at this moment. I have placed numerous Hellopeter complaints against Teljoy due to a double deduction of rent which I was never informed of. After month1 I phoned the agent and we agreed to an installment on the outstanding amount. After this telephonic conversation the outstanding balance were deducted from my account plus the monthly rental. AGAIN I had to lodge a complaint for this as this was not in line with the arrangement. Teljoy then assure me that the debit order is corrected and the 'outstanding' amount will be deducted with the monthly rental. AGAIN I received threats that my account was in arrears upon which I contacted Teljoy and they assured me that everything is in order for the payment arrangement. I have wasted my time every month trying to sort this out and NOW I got declined for a contract due to Teljoy listing the account as 30days outstanding. WHAT is the use of making a payment arrangement if you list me as a bad payer? I went through all the trouble with the arrangements to avoid this but Teljoy just keeps on going back on their own arrangements. I am very unhappy as Teljoy has now harmed my credit score whilst I have an arrangement. This is UNACCEPTABLE and I again stress that I am at the point where I do not want to do business with Teljoy due to their inability to keep to their own arrangements. You cannot list a client as a slow payer if YOU made an ARRANGEMENT with them. This needs to be fixed ASAP or I will dispute this and also report Teljoy to the Ombudsman because I have been trying to sort my account out for 3months. I really am very very very sorry that I decided to do business with Teljoy based on the harm and waste of my time.