Vodafone India — no signal in my number and failing to register on network

Sir/mam,
I had purchased an vodafone sim and put into in a smart watch model name: bingo c6. It is functionable till one day but after that suddenly there is no signal and when i rebooted my device it's showing invalid sim. Then i tested it in my android smartphone there also it's showing same problem. It's my humble request, kindly fix this stuff.