Wesbank Customer service

I financed a bicycle with Wesbank in Jan 2023 and on the 14th of March 2023 i paid an amount with the aim of settling the bike,i there after remembered called to notify the team that amount paid is more than settlement amount, i was informed i ahould wait 48 hours for amount to reflect. On the 15th amount reflected on the account and i called in again to ask that a refund be done as amount paid was more than settlement amount. I was informed to send mail to ***,i sent a mail on 15.03.2023 and since the mail was sent, i have not received a response or acknowledgement,yet installment will be going off again in 2 days for a paid off account.