Discovery reimbur*****t

I am very unhappy with the service I've received from Discovery. I put in a claim for a reimbur*****t that needed to be paid back to me, my ex husband's banking details was loaded. I phoned regarding this exactly a week ago for them to change the banking details to mine, since he isn't a even a dependent any more & I am the main member, the lady that assisted me phoned be the day after and confirmed that the service has been delivered, the feedback came to be that it will take up to 4 to 5 working days. It's 5 working days later.... I phoned this morning to get feedback, it seems that they have not done what I asked, the banking details was not changed, after I specifically asked for it not to be paid into his account.