FNB bad service

I was double debited by my Fnb home loan from my Absa account twice on the 30/10/ 2021 and on the 2/11/2021 I contacted Fnb contact center on the 03/11/2021 they say is a system errors which I understand Thursday on the 04/11/ 2021 they send me forms to complete and I email my bank statement as per request but till today no response even their call center when you phone their very Rude and unhelpful