Non-payment of end of service benefit by ex-employer

Non-payment of end-of-service benefits.

My husband left his company last mid-May 2019 and is now currently working at a new company (both companies are from Dubai).

Up to this date, he still has not received his last pay & gratuity payment from the company he left in which he worked there for almost 5 years.

Upon leaving the company also, he did not sign any letter on receipt of the final settlement. We have been constantly following up on when the last payment & gratuity will be settled.

But the HR just keeps on saying to us that they are "waiting for funds, waiting for client payment...". This keeps going on for the past 4 months and not a single Dirham has been paid to my husband.

We are just waiting in vain, & there is this worry that he won't ever receive his end of service benefits because of these reasons.

Need some legal advice on how we can proceed and push his former employer to pay their dues.