Hathway Cable & Datacom — no installation and response after paying the amount

On may-05, an executive called to renew my service and i informed her about my past bad experience with hathway and poor customer service.. She guaranteed that she will send the executive in 2 days after i make the payment and so i did.. She then blocked my number and each time i call her, i get a busy tone.. Calling the customer care everyday and explaining the issue became my daily routine.. As per the hathway records, modem details doesn't match with what i have.. And because of this, somebody else is using my data free of cost.. Tickets raised by customer care are closed without contacting me atleast once. I want the hathway to refund my money as early as possible.. It's been already a week and no initiative taken from their end to solve my issue or refund the amount.