Denial to get PROOF OF PAYMENT

I never hated bank like Investec.They are *****ster, ******s and useless.In 2010 my mother in law invested amount with this ******** and suddenly she dies.The high court request us to appoint the lawyer who the money will pay out and destrebute to beneficiary.Invstec paid money to the lawyer 2011/12 the lawyer unfortunately misuse the funds and was st******* from practicing.Now the lawyer disappear with file and the high court needs proof that show's the money was indeed transfer to lawyers account.We call Investec from then till today',they say they don't have any record's and they even don't want us to enter building.ALL THAT WE NEED FROM INVESTEC IS SIMPLE PROOF OF PAYMENT,Why they denied more harsh step to.Watch we are coming for you with media