Hathway - Hathway Broadband Internet Annoying calls 2030 times a day

I used Hathway broadband for about * years before moving to a new city and discontinuing use. Later, I terminated the subscription via the website, activated DND, and did everything I could, but they continue to call * times per day and ask me to recharge. If I scold them or tell them not to call, they simply hang up and call again from a different phone number. They phone in the morning, afternoon, and evening. I've attached a screenshot of phone call history from truecaller. They are all owned by Hathway Internet.