SPEED ISSUE AND POOR CUSTOMER SERVICES

Hello my name is Anirban Saha, i am staying at laketown kolkata, I am using Meghbela broadband for internet usage, they told me that if i am using 256 kbps connection they will provide me minimum 30-35 kbps speed in single link, but now when i download any thing from single link, i am getting 10-15 kbps, i called the customer care they told me its temporary issue as soon as possible they trying to fixed it, but i faceing this problem since last 2 months, and my 2 nd complain is that as per TRAI rules all ISP should keep maintain minimum broadband speed 512 kbps, all internet service provider maintain this rules apart from Meghbela broadband, so sir my humble request is that pls take an action against this,

Thanks in advance