Disappointed client

I have been paying my policies without missing a payment my mum recently passed away and the payout i was suppose to be given was less then the actual amount .Firstly i have emails since 2020 where i asked for the date of birth to be corrected now i receive an sms due to incorrect date of birth a lower amout would be paid .Unfortunately who has not done there job!!!!this shouldnt be my problem as i have solid proof of the change.now the policy payout 8000 less.keep in mind i never claimed and i always paid on time.always time to payout there are a million stories.