BSNL — 2g/3g speed issue

Respected sir:
Past 3 years iam regularly using bsnl network for internet connection. Now a days (1 year) that particular company provide very slow internet connection. I complaint lots and lots by customer care and directly i visited towards head office. They are answering like a #. And they are treating me like a dog. Please resolve me and like peoples problem and give back my self respect.