Account paid up and matter not being resolved

I received my statement on the 9th of March for my last payment to be made to Bruma finance. The payment stated that I owe R373.25 which is my last payment to be made to them. I made the payment on the 23rd of March at Absa in Southgate. On the 26th of March I phoned to find out if the payment was received and I was told its not reflecting and it could be due to me giving my name and surname as a reference. Kgomotso told me to send the payment through by email and I did so but got anautomated response that said I would be contacted in 24 hours which never happened. On the 8th of April they send me an email telling me that my account is now in arrears. Nobody got back to me since the 26th and ever since Nina and Tamryn as well as collections@brumafinance has been emailing me,each time sending a different statement and different amount that is outstanding. I dont owe this people anymore but now it seems they are trying to suck me dry. I settled my debt and all they are saying is someone will get back to me but nobody does. I want my account rectified and details removed from their system. I now regret ever taking a loan with them.