Reliance Jio Infocomm — very very slow internet speed and call drop problem

Address:

Surat, Gujarat, 394107

I suffering from very worst internet speed in my area (amroli, surat) I have complained to jio customer care many from last 3 month, but they are just saying that we are working to improve speed, but we can't commit date.
I has bee almost 3 month how much time they will take to resolve problem.
They are taking full payment in recharge but not providing proper service this is clearly beach of contract.