Business ProfileforSouthside Bank

In January of this year my Dad had a accident in his Truck so Shortly after he had health problems to come up so when he got the Insurance check he held on to it due to the health issues for almost 6 months so he took it to his personal Bank Southside and Deposited into his account well when the check was sent for Endorsement from 5th ********** they sent the check to Southside Bank in turn it was Deposited into my Dads Account **** 5th ********** never Endorsed the Back but Southside Deposited it into his account so fast forward ....We put his truck into the repair shop around Middle of Sept of this year We get a rental car paid for thru insurance until Truck done Repairs was about 3 weeks on Oct 3 Repair called said Truck was ready We Go to Southside Bank There is a Hold on the Money they kelp giving me the run around i work my Dad Has Dialysis 3 times a week we can not let the rental go back cause We will be Stranded so I finally Spoke with 5th ********** got someone that would finally listen She tracked down what happened She Told Me Southside should have never cashed that check with no Endorsement on back so Fast forward i spoke to Branch Manger AND Voiced My Conplaints to them them after months of there mess up I do not think they understand what has happen here or dont want too as of Dec 4 out of lots of fustration and waisted hours i had to take off from work as well of $850 to Enterprise rental and storage fees for the Truck sitting could you please help me resove this issue t