Finchoice clear my credit score as you messed up my record

During December Finchoice deducted my December installment on 18 December already. Then later they send me reminders my payment is due on 27 December. Then the first week in January i get harrased daily by an agent Nola telling me to make arrangments as my account is arrears. Remember I already paid in December. Only after posting here did they check and appretnly acknowledge it was a glitch, conveniently. Well Finchoice agents now that glitch has affected my credit score and i have no credit available to me at any institution because you didn't clear the error which was caused on your side. After posting on Hello Peter , Finchoice agent Hayley sends me emails with total no knowledge of what the query is , i wonder if the person actually went into the account to check what was happening or what i was referring to. However when i respond on email asking for a call back to verbally explain what the issue is Hayley does not respond. So now i am sitting with a negetive credit score and no credit available because of Finchoice's mess.