Hathway — Getting message and calls after terminating services 2 years ago

Team, this is pathetic that I used to have hathway broadbamd connection and terminated it 2 years ago..

Am still getting unwanted call and messages from respresentatives and now they started messaging me in my whatsapp too.. who the hell has given authority to contact me in other means.. is this kind of breach? Help me to resolve this

My account id: [protected] and [protected]

Thank you.