Unpaid Pension claim from Old Mutual

Have a pension policy that has not paid out due to a company that I worked for that close down. I was contact by company representing Old mutual to get me to fill in claim for unpaid pension. Thsi was forwarded to Old Mutual April 2022, Was advised by Old Mutual that it would be paid out in June 2022. ENd June, kep on calling the call centre who kept on advising that it would still take some time. After many follow-ups, I was eventually told that the due pension had been paid out, but that money return due to wrong banking details. Call centre could not help me to correct information, forwarded me to a person which was impossible to reach telephonically. Mailed many times, phoned many times, eventually November 2022, lady by the name Wendy Johnson, picked her phone up. Discussed the matter went through a process of correcting bank details, was then advise that payment was to take place 1st week December 2022. This is now 14 March 2023, a year after I was advised to forward the claim. Recently managed to get hold of the Wendy Johnson, who once again advised that payment had been made, but after I advised no payment had been received, complaint was escalated to senior person by the name of 'Belinda Finlayson, Team Lead who then send me a mailed apologising profusely for lack of response and promised to investigate the matter and get back to me within 24 hrs. This was 2nd of March 2023, since then I have send various mails following on the last correspondence without any response, not even from OLD MUTUAL complaints that was copied on the mail each time. Am lost with out options reason why I am raising this review.