Netplus Broadband — Refund of excess amount paid.

I Gurjinder applied for a netplus broadband connection on 27th june but because of some issues and non resolution of issues i terminated connection from customer care on 10th of july. after that so many emails made to netplus for refund but no response. On 3rd august the box was taken off from my place and got activeted at some else place and i received a message that connection is active now. I made too much calls to customer care as well no resolution for the same. Now mobile number changed in connection but what if email and name also got changed in company's database? please help to get solution of the issue and refund of my excess amount.