I don't think Zoom Phone is what I thought it was - how do I cancel...?

Hello

I don't want to go into too much detail, but I am desperately trying to find a VoIP solution. I am in a very precarious situation where I do not have access to either a landline (because there isn't one) nor a mobile (because it's been stolen). 

I am in need of urgent legal assistance but, as soon as I explain to solicitors that I can't give them a phone number, they stop responding to me, so VoIP is the only solution, and I mistakenly thought that Zoom Phone would work a bit like Skype (RIP), rather than it being a physical device, which is of no use to me. I signed up in desperation I'm so tired, hungry and sick that I'm not thinking straight). 

This obviously isn't a business, it's personal use by someone who is trying to keep themselves alive! I can't afford to waste money, so how do I cancel...? And can anyone suggest anything that does what I need...? I have a MacBook Pro (running macOS 15.3.1) and an iPad Pro, running iPadOS 18.3.1. 

I just need a VoIP phone replacement, as it seems to be the only way I'm going to be able to access justice. I hope someone can help, my life literally depends on it. I don't have much money, so I can't be wasting what little I do have on something that isn't going to be any use to me. 

Thank you

SJ