Bad customer service

Terrible Service from their agents. I have been waiting for my refund for the past 2 months. I submitted all required documents, the turn around time for verification is 21 business days and 2 months late I'm still waiting. What a horrible experience, audit was done for my 2023 return but no outcome for my 2022 return. Agents would be mute when you ask them questions and end up wrapping up calls. Can someone please assist me.