Bad service and lack of transparency and accountability

Im extremely disappointed with old mutual and the horrible service delivery. I submitted a claim for my deceased mother in December 2018. At that time i was only given the amount of the retirement annuity and not of the investments. They told me they had to go and do their calculations so that they can determine how much i am supposed to get. I did not complain because i didnt know anything except what i was told. They then gave me a printout of the amount left from the annuity saying that was what was left. All of a sudden when the funds come in, completely different from what was on the printout. When i visit the branch to ask. Im getting several explanations that dont correlate. The same explanations i got with the investments that i did not complain about. Right now im being told i should wait for the person that helped me with the claim after all these months. Its very dissapointing.