Incorrect banking details/ Payment not reflecting/ Credit report affected

I opened my account just before lock down. I was told that I will get banking details for Eft payment in Welcome pack. There was no banking details except for what reference nr should be. Looked up banking details for Builders ( I have a “Builders” card) on their website. Then received numerous phone calls and sms’s stating account have not been paid( almost paid double). Called number on documents and was told I paid into wrong bank account? Expected me to go to bank for proof of payment (proof was e-mailed to e-mail on welcome pack) They (RCS) were not willing to assist to retrieve money from Massbuild ( account for Builders I paid into). I was fined on account ( about R160) and “Missed payment” is reflecting on my credit report! I app**** for one account and now it is another? Should my payment not reflect anyway since it falls under same company? I expect my payment to reflect correctly and for my credit report to be cleared. Not happy with service so far and am definitely going to close account ( which are basically paid off except for fine) They are very quick to open account but not to communicate proper payment details when asked! Opening this account was a mistake!