82 year old not assisted after 18 months of requests.

We have been literally fighting with old mutual for 18 months to sort out a financial dispute. My handicapped brother moved his investment some time ago and when we went back in documents the broker took off R29 000 for tax / but my brother being handicapped never worked a day in his life or has EVER had a tax number. We feel this is theft. This broker was working in house in a Nedbank branch snd is now in Cape Town - ignored our correspondence via LinkedIn. We have visited numerous old mutual branches “who can’t help us” - sent over 80 emails and made at least 100 phone calls - my dad is 82 snd the way he has been ignored and not helped is disgusting. I’m hoping management can cone forward and assist urgently!