Useless debit card dispute

I need some kind (any for that matter) of assistance. I lodged a debit card dispute on the 14th of February 2020 for amounts I did not authorized. The funds were put back into my account on the 18th of February 2020 and then taken back again by FNB on the 19th. From the first dispute, I have not received one phone call or email (as their email said you will receive feedback within 5 working days). I have now been on the phone for almost an hour - to which one call center agent decided to put me on hold for 40 minutes alone. Phoned again and yet again put on hold and then just transferred to a agent who's calls goes to voicemail automatically.

I just need FNB to rectify their mistake and give my money back. It is like deja vu with them all over again.