Siti Broadband — broadband speed is not as per the plan

I have a indinet internet connection provided by siti operator, and my plan is connect_60 which is supposed to provide a speed of around 60mbps, but for the past few weeks the speed is very poor. It is found to be around 20-30 mbps and at times it is less than 10 mbps as well. There is frequent disconnection of internet service and the local operator does not respond to calls and does not even care to resolve the issue on time.

I have paid upfront for 6 months package, and i feel it's total loss for me, as the service quality is very poor.