I am tired to this company. The whole year we have been calling and not getting answer

Since January this year, I went to old mutual branches. To submit documents for my late mother's investment. Till today they haven't paid the money. The worse thing is, I did submit documents and got sms few days later that I need to submit the same document. Which I did at their branches. I may have went to their branches 5 times or more. On the 21 January they did credit check on me. I don't know why.