Dangerous trigger - ZEV Technologies ZEV Pro Flat Face Glock Trigger Drop In Kit

Ordered the Zev trigger kit and installed it on my Glock 17. I noticed immediately that it failed the safety test on trigger reset. I checked a few things and saw that the unit was out of spec. The safety disconnect was also out of spec and would result in the gun firing as long as the trigger was depressed. I contacted Zev and after questioning me the technician agreed that it was defective. I removed the parts and returned it to them. After five weeks I contacted the company wondering where the replacement was? The USPS lost the package and now I find my out of an expensive trigger that wasn’t insured. The company doesn’t care about customers and makes possibly dangerous products that should not be installed by someone with little knowledge.