Contractor threatening lien in GA

Events: -Subcontractor claimed he did not get paid by GC that abandoned my property project with 20% of work done with fully payment in hand. -Sub represented himself as wanting to help after GC abandoned, so I hired him directly to complete work. -Now direct contractor, he collected full payment from me, and he also did not complete work, and left damages. -I requested refund for work not completed, contractor agreed to only half refund of payment as per their refund policy and them starting the project -Credit card reversed payments filing in my favor, after proof was submitted that work was not delivered. -Contractor is now proceeding with lien claiming he did work and provided materials for property that he was not paid for. -Contractor not only didn't complete work agreed to, but he left damages that had to be repaired for additional cost with another company. -I have records of another company I hired after the contractor, that did the work the contractor is claiming he did. -I also confirmed that when he was subcontractor for property, he was paid for work he did not do, which is inconsistent with his claim that he wasn't paid by GC. Questions: 1. Can I claim funds that I paid to GC who then paid subcontractor, that subcontractor did not deliver for? 2. Can I represent myself in Small Claims, contesting lien? 3. If contractor wins suit, what will I face?