Capitec up to its usual tricks

Capitec Business : I have a verified payment from FNB to my account, which after 7 days didnt show. I contacted FNB to verify the payment. Capitec has now claimed they rejected the payment into my account and returned to sender - why ? They cant and wont explain. I also don't have proof or an email to send to the company who is trying to pay me as Capitec close the case (by email) I am furious. Ongoing hassles make me wonder why I am still banking with them.