My Xtreame Broadband landline no. is someone other using

Messages
23
Location
MAHARASHTRA
ISP
Airtel JIO
my broadband connection is active from about 2 years.In my area no landline connection started just fiber.i am just tried 3 days before that my landline allowed to me for broadband is someone other using i try customer care mailed them but no response. how someone using my no. for incoming and outgoing that alloted to me?
can anyone face this issue? and how to solve this issue?
 
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