Loan query

Good day. I am banking with Capitect and I am not happy with the stress they causing me.I took a Loan a 12 month loan with them October 2021 and the contract ends September 2022.Every month they debited and I skipped 1 month payment on December 2021.When I checked my capitec app this year march it shows that I'm in arrears of R1400.I went to the branch to find out how? Bt they said I did not pay,I told them that I did pay and the month that I did not pay was for December 2021.They told me I should check with Fnb because I did have acc there by the time I took a loan.I told the consultant that I did closed Fnb Acc.The told me I should go to Fnb and check,I went to Fnb and indeed the acc was closed.I have been going to this branches up and down since March this year even now.Last month the lady at capitect requested for a statement from Fnb because she said they want to check if the money for the loan did not go to my Fnb acc,I did provide them with the statement that shows the dates of my acc being closed.The lady from capitec help desk said she will contact me.July 2022 capitec debited me for 2 month,I told the consultant that if they debited 2 month it means that other money will settle for the month that I did not pay,which is December 2022.So they have being debating every month until September.Last month they also debit which they were not even supposed to debit.My contract with them ends September 2022.I have being waiting for feedback from capitec even today they never erase the arrears nor to refund my money for last month.And I have not even receive any call from them like they promised.Today I call the call centre and explain the story again,the lady said on their system it shows that I did not pay for last year one month.I asked her how is that possible because at the branch when they check,the debit orders for the 2 months was successful.It show on my savings acc statement at the branch.This people are playing with me and they dnt want to take accountability. Hello peter I am stressed,I dnt knw what to do anymore.Can you please assist me with this matter.Please contact me on this number: *** Thank you Thandie Jonas