Resigning and claiming labour dues after signing the cancellation paper

Hi

I need your advice, please.

I resigned and completed my notice period upon transferring my visa from DMCC to TECOM. My employer sent the end of service settlement along with my last salary and leave benefit.

Now, to complete the process, they need me to sign that I have received the amount which I didn't. My previous employer is saying they don't have money right now and to sign then they will pay once available.

My question here is that if I sign, do I lose my right to claim the money if they didn't pay?

If yes, what kind of legal document or cheque can I ask them to provide prior signing? I'm hugely affected as I can't transfer the visa.

I have asked DMCC and they said I can file a complaint for them to try to settle but I'm sure my previous employer will come and say no money without solid commitment to pay.

Then DMCC will advise going to court which might take a long time. I don't like to make problems but I need advice on what I can ask them to provide to secure my money and to transfer my visa.