I canceled my Pro subscription but people can still leave me voicemails and call my number

I canceled my pro subscription back in May when I closed my business for Maternity leave. I am not planning on reopening my account when I go back to work. I still have the app on my phone but my account is now basic so there are no icons to call or text people. However, people are still able to call me as my phone will ring on the app but I can't answer it. They are able to leave voicemails, I don't get a notification but I get the transcript via email. They are still calling to book my services so I assume my voicemail is still active. I have taken down my number everywhere I had it advertised before. How can I cancel this number? Now that my account is basic I have no access to phone settings on my account (as they shouldn't exist but clearly it still does) and I have no access to support to solve the issue. Has anyone had this problem and been able to solve it?