Tata Docomo — Tata Docomo number got invalid abruptly

Address:

Whitefield, Bangalore

My sim number suddenly became invalid and I have linked so many accounts to this number, there's no intimation of service stopping and when I m trying to call customer care I am not able to call even as message is popping up mobile service not registered on network, kindly help me out in re activation of sim as its is very important for me.
On 5th of Dec 2021 I've checked the Validity which is upto 2026 then after 2 days I've checked, number shows invalid.
It's quite critical, please take it as priority and enable it again soon.
Tata Docomo Number: [protected]