LazyPay — My Vodafone Mobile Number [protected]

I am receiving many calls from Lazy Pay for the last few weeks from [protected]/[protected] stating that there is an outstanding bill to be paid to Vodafone. I checked myself with Vodafone and there is no such outstanding. I have warned them several time to stop harassing me but they are not heeding to my warning. Sent an official mail to Vodafone and Lazy Pay with a warning and if they don't stop I have no other choice rather than to file a FIR and followed by legal action against this company.