The VoIP companies I tried before VoIPo all had the same policy. Send us the undamaged ATA and we'll refund your deposit on it. May take a week or two. I don't know what the OP's beef is.

Same policy on keeping the ATA. But getting unlock passwords can be a problem. Or reset to factory defaults if that can be done after termination of service. I prefer to not BYOD so there's no question that I mis-configured the SIP client settings.