Payment made but no goods received.

I paid for a replacement engine for my vehicle on the 19/01/2023. Payment was made into the bank account details provided on their invoice. Up until today 25/01/2023 they keep on telling me they, Japan Engine Auto (Pty) Ltd have not received the funds. I've checked with my bank and they confirmed that the payment was successful and the receiving bank - African Bank has received the funds. I have followed up daily to enquire but keep on being told that they have not received the funds.