Hathway — Hathway threatening calls and not removing the connection

After so many times of intimation also hathway connection is not removing
and again threatening me on the same with this number [protected].I tried
to reach out to that number number of times, they are not lifting and tried to
contact hathway customer care not connecting. For more evidences/proofs. I
have the call recordings as well.
Note: They are calling after 1-2 years and made me pay around 600
otherwise there will be a legal action and then I asked them remove my
number and connection, they said ok sir, but not removing and threatening
me and trying to forcefully make me pay the money to take connection.
Please solve this issue.