Southern Lawn Equipment review: Portable generator. Not honoring purchase order. Jacking up the price $ 500.00.

Southern Lawn Equipment. 3533 Murfreesboro Pike, Antioch, TN, 37013. On 10/4/2021 I ordered a Generac 5735 GP 17500 E Portable Generator from SLE Equipment for $ 3159.00 and paid them $ 500.00 down (my credit card) to ship me the next one they got in. Their purchase order # 284574. Took them 6 months to ship me one. Every month I called and there was a new excuse. Then, on April 24, 2022 they called and said they were shipping one to me. They then hit my credit card for $ 500.00 too much. Their invoice to me showed a new purchase order. Where did my original purchase order go? Their shipping ticket (4/24/2022) to me shows the original purchase order on it. They have refused to respond in writing about my $ 500.00 deposit and why they refuse to honor their original contract.