Hathway — Regular SPAM Calls even after requested for DND

My hathway account number is - [protected]. I opted out of their service on 19th November 2022. I have been receiving multiple calls from multiple numbers on a daily basis starting December 2022. I already requested not to reach out to me and mark me in the DND list. However, even after several warnings and request, I am receiving calls which are affecting my mental health.