Recommendations for replacing Comcast Voiceedge IP phones

Looking for suggestions. The functionality of the phones is fine, but the support is incredibly lacking. When you call comcast, its hit or miss if you get a tech that actually knows what the F they are doing.

We had a good sales guy that was responsive to our high level issues, but he has since left the company and the new sales guy couldn't care less. Therefore, we are looking to rip and replace.

Anyone got any suggestions? New phone system doesnt need to be super fancy, just phone trees, VM. Taking calls on a cell phone app would be a huge plus for our sales team members.

No I dont want to do anything soft phone related or Teams related. Im looking for an over the top system that we can just plug and play.

I've looked at 3CX but not super impressed. Heard terrible things about Jive.

So what say you, fellow sysadmins?