Airtel — Airtel broadband not working six months

My number is[protected] and I'm having this number for past 10 years in the name of clarence but now for past six months is not working properly and the service is very poor working for one week again the same i am fedup of sending mails and calling customer care but they are not bothered to solve my problem I can change the service provider but the number is given to all customers and i am helpless and engineer is very bad always gives false information and very rude the to us his name Mayavel and number is [protected]. Kindly help us to solve my problem. Thank you
Regards clarence.