What is the seat belt law for a 1976 el camino?

So I was driving home from work today and I was pulled over for a seat belt violation. I drive a 1976 El Camino classic and the seat belts do not work. I was certain there was a law that attorneys call "the good old boy act" in Georgia where it is not authorized for a person driving a truck to wear seat belts. My girlfriends mother is a paralegal in an attorneys office and she also told me this. My Camino is considered a truck and it states that on my registration also. I asked the officer who pulled me over on this charge what the law was on this and he said that he didn't know exactly but still wrote me a ticket. On top of that he asked me repeatedly if I had any weapons or drugs in my car and after repeatedly answering him no I do not he told me to step out of the car. He then told me to turn around and place my hands on my head as he searched me. He never gave me a reason why he searched me and then he proceeded to search my car before I asked him why he had to do that. I asked him what probable cause he had to search my car. He ducked down in my car and knelt in my seat before he stopped. He then told me after he came back from his car that my license were suspended due to child support violation when I have proof from my pay stubs that my support is coming out every check and made me sign a piece of paper without giving me a chance to read it, then took my license and said someone had to pick up my car or he will tow it. I called my girlfriend and told him she would be here in 6 minutes. He said okay I don't have all day to wait around so I'm going to go. A few minutes later my girlfriend came and picked up my car and we proceeded to go home. As we turned onto our road which was only a minute away from where I was originally pulled over he was hiding behind a BP gas station and immediately pulled out behind us. After we crossed the county line and he was out of his jurisdiction he put his blue lights on in a double yellow lane and sped up and seemed to be passing us but instead he just slowed down as he passed to make sure it wasn't me driving. He then took off with his blue lights still on and sped up to at least 90 on a 50 mph road out of his jurisdiction. Is there anything I can do about this inhumane treatment and discrimination? I called his lieutenant and he was very unprofessional and ended up cutting me off every time I tried to speak and when I asked him about the jurisdiction issue all he said was "we have jurisdiction all over the state" and then he hung up on me before I could finish speaking. ................This is the Walton County Sheriff's Office in Georgia that I'm talking about and the officers name was Parker with a badge number of 4469. So if anyone else has had an issue with Walton county sheriffs officer please contact me so we can stop this. It isn't right. I am a 6 time combat veteran and I feel that I was just reduced to a common drug dealer/thug, when this all started as a seat belt violation in a truck.....Please help me. Thank you..........Billy