Claim filed in Jan still not received, it’s May now

I have never been so patient with a company before like I’ve been with momentum. My previous employer filed a claim for me back in January when I resigned, the beginning of January to be exact. I have not received any payout and I’ve had to call since February to try follow up as to why. I’ve been calling every week at least two times a week for progress and I have been responding to queries they have with my claim but It always seems like I start the process again each and every month just before the payment needs to be made. In the meantime I’m losing the interest I could be making from the payment on my savings account (3 months), I’m also spending money making these calls every week. The back and forth is not working it’s gotten out of hand. We’re in the month of May now and I’ve just been asked for bank confirmation once again which means I’ll be waiting for another month and they’ll say it just needs to be verified and just before it’s verified when I call again someone else will tell me they have not received my bank confirmation details again and so the process goes on again. At first it was said it was because of the rates that have gone up …then it was my banking details which I then sent new ones now it’s just a waiting game on verification