Repaired new unit arrived after repairs - untouched and still faulty....

I bought two 3rd Party Garage Door Motors from Makro Order No MAK***. The order was dispatched to me on 09 Sept 24. One works like a charm, the other failed withing 4 days. I logged av call REQ *** and Makro sent a courier to collect it and sent it to the 3rd Party. I paid R450 to uninstall the unit. The unit was sent back to me within a week, totally untouched. I did not know this, so paid R450 to install it a 2nd time. It did not work. I paid R450 to uninstall it a second time and Makro again sent a courier to pick it up last Saturday 12th October. Today I got a mail from Makro, saying the unit was tested and the batteries were flat and replaced. They will do noting further to the unit (nor refund me) because it is (NOW!!) a used unit and will return it as is. If the batteries are flat, it shows there is a fault with the charger. To test it, I will again have to pay R450 installation fees. I want Makro to come to the party, they should pay me R1800 for install and uninstalling costs and refund me or replace their now used (new - sent to me Sept 24) unit. Help desk can't help much, they can't even put my call to management, so now I will try Hello Peter