You can always track UAE visa application and check its validity through the UAE Government's online and offline facilities.
For any queries on visas and residency permits issued by the governments of Abu Dhabi, Sharjah, Ajman, Umm Al Quwain, Ras Al Khaimah and Fujairah, contact Federal Authority for Identity and Citizenship (ICA) on the toll free number 600522222 (from within the UAE) or through its feedback platform.
For Dubai visas, contact Amer service on the toll free number 800 5111 if you are living in the UAE. If you are outside the UAE, call Amer on the toll free number +9714-313-9999.
You can also check about visa issues through GDRFA - Dubai.
Updated on 10 Jan 2021