Please assist

I contacted the developer, and told him that the module have issues need to be fixed, but he told me this is new requirement not issues and asked to charge for that fixes. and payment be in advance, i did that and sent money , and he worked and sent modifications, then i found errors and contacting again and asked to fix then told okay, then sent module, then found one issue not fixed and i told him. then no replay from Thursday tell now. the idea of module is good, but it is not completed and have issues. i will list the issues i paid to fix: 1- module work only on variant not on product template ( i paid for that to fix) 2- there is no way to choose the default UOM , so the default UOM will appear in POS even that it not used in POS. ( also i tolde the idea and paid for that but it is partially fixed). the current issue : when the products loaded the default price we have chosen not appear on the product info rather , the unused price appear, i asked to fix but no reply.