Vodafone India — no network at my office

Address:	Mumbai City, Maharashtra, 400002
Website:	Vodafone India

NETWORK problems in my office.(at Bhuleshwar) since last few months.
There's only one message on phone
NOT REGISTERED ON NETWORK.
Have sent several complaints emails to various authorities but all in vain.
I am given assurances that it will be done in 3 working days but I'm fed up of your answers.
I'm missing all my important business calls and emails.
Kindly solve my network problems.
Regards,
Kaushal Enterprise