Disgusted y Capitec Service

I resigned a year ago and have requested capitec to change my loan debit date from 25th to the end of the month. I provided them with U19 forms and more yet the consultant at kc branch tells me they end my resignation letter. This is appalling...what does my resignation letter have to do with them. I have the U19 exit form completed, momentum payout etc yet they want a personal resignation action letter I sent ro my employee a year ago done on the work computer. Worst service amd bank ever in the meantime they charge me I treat every mo th for late debit. I'm disgusted by capitecs service