NO FEEDBACK ON INCORRECT BALANCE ON MY LOAN

I app**** for a loan, and requested the loan to be cancelled. I was told, that if I repay the loan within 48 hours, it will be cancelled. I repaid the loan on 2 May 2018 - the second it cleared in my bank account. I sent through proof of payment, I have phoned twice and I have sent 2 emails regarding the interest to be cleated! The interest IS STILL REFLECTING ON MY ACCOUNT with no feedback received!!!! Worst service ever