late mother claim

I have emailed on many occasions on<br> an account that my late mother had<br> with bidvest 4 years later still no<br> response nor any resolution of some<br> sort. have they taken the funds and<br> closed the account with not informing<br> us noses<br> does it take 4 years to respond to<br> account enquiry<br> please assist<br> Nancy khan(late mother)