Hathway — Customer service not responding

My connection is currently closed as I left the town. I have submitted request for new plan. I tried contacting all the numbers available for customer care but none of them are picking call it is only available for TV connection but there is no customer care number for broadband connection. I was finally able to contact the customer care but the person disconnected the call without hearing complete details it happened multiple times. I registered my complaint on there app there also they closed it without contacting me. I am fed up of there service. I want to disconnect my service with them and return the router but they do not have single place to contact them.