BSNL Cbe Sde — Plan 140(Excess billing)

My landline in India is[protected].This is only on plan 140.But resent month bill comes around Rs3000.I accuse telephone department persons utilize my phone illegally and make the excess bill on consumer as we use landline only for receiving call.Also we use mobiles for communication incuding international calls.
Hence kindly find the culprit or please disconnect my landline connection.

Presently I am in workng in saudi Arabia as engineer.