Complaint about payout

I reported a death claim of my mother on the third week of December, and on the policy I have been paying R134 for 12years. When I went to make the claim they told me that I hAve given them my mother's incorrect date of birth instead of 1928 they say I gave in 1956 how can one mistaken his mother's date of birth. Old mutual please with all due respect I covered my mum with R11000 they paid out R2690 can u burry sum1 which such money how sure are that it was the adviser who made the mistake because they wanted us to join with affordable prices. If it was to that extent why didn't you guys pay back my premiums than making suchanges calculations I am burying my mum not a dog I am pulling out of this old mutual group scheme I joined u guys long ago when u take our premiums u do that with a smile payout u look for lousy excuses u r number one in the country with regards to service I was hoping for the best cause I never claimed for 12years full but I got surprised my mum didn't even get a tombstone I am now looking for means to do that out of my pocket I am toned apart with ur service I even sent an email to complaints u did not respond I had no choice but I hope Hello Peter will help.