Very dissapointed

Im writing this on behalf of my grief stricken mother. My mom has had an account and investments though FNB for a very long time. My mom just recently recieved her money from her late husband, through old mutual. Without contacting my mom in any form, the just froze her bank account, she then went into the bank to figure out why and they said that the ***** department froze her account as there was a big lump sum of money in her account. They requested all documents from old Mutual, my mom supp**** FNB with all the relevant documents. I feel this action on her personal accounts is very invasive and unacceptable under her circumstances of grief. My mom has got anxiety induced depression from my dad passing away, she has had to go to the Dr twice, without cash, she owes the Dr money, her debit orders are bouncing and now she must deal with this **** from FNB. My mom was going to invest her money through FNB.........THERE IS NO WAY.