After ordering a lift gate support for my 2012 Cad...

After ordering a lift gate support for my 2012 Cadillac SRX, the part arrived within 6 days. I unpacked the part and installed it on the car. Installation is simple, just remove two spring loaded clips and snap into place. After installing support I tried the operation, this is where things go bad. The lift support would not extend. This prevented liftgate from opening. Upon contacting RockAuto I was informed they would not make an exchange or refund because the part had been installed to the vehicle. Now there was no way to KNOW the part to be DEFECTIVE until it had been installed. I will never deal with such a company that has no integerity.