Bad customer service

So frustrated with Makro and Verimark. In October they had these Drones on sale. I like to buy Christmas presents ahead for the kids. My son flew one in the shop and it was nice. So secretly behind his back I got one. I did not open it at home as I wanted the box new for Christmas. Should have checked it in October. On Christmas day he took it out of the new box, and it never flew. It could not stay up. So it went back in the box and december the 27th, we returned it to Makro. It took arguing for them to take it as it was bought at the end of October, therefore we must have flown it for 2 months already which we did not. Finally they agreed to take it and fix it. 3 weeks later I went to collect it at Makro. To me it looked like nothing was done. Box the same, no note saying what was fixed. So I did not trust that anything was done. So I demanded an employee of Makro returns to fly it to see if it would work before I took it back. No one could fly it, as it was a Verimark product and they were not allowed. So finally after an hour wait, a Verimark girl came. She had no idea about drones so she got a male Makro employee to fly it for me. He showed me one of the propellers did not rotate, so that's why it never went up. So basically nothing was done since I returned it. Somewhat mad but staying calm, I demanded they would take the product back again. I could not get money back since it was bought in October, fair enough, but needed a new product or it fixed as it never worked from the start. Manager was not in store. So, the product was once again left behind. Yesterday I wrote them why I still had not heard back from them almost a month later. I Got a message an hour later to collect it today. So today, full of hope and faith in costumer service I went. AGAIN, the same box, nothing looked done. So AGAIN I said I won't take it unless they could proof would fly. Again got a sale person of Verimark to fly it. The girl looked at it, had no idea, read the instructions and tried to fly it. "There is a problem with the remote", she said. So I argued that I brought it back with a blade rotation problem and get it back with a remote control problem? I never touched it in between. She said:" maybe by mistake they switched it when they fixed it???" A few phonecalls were made and about 30 minutes later, still no solution. "We have none in stock, there is nothing we can do" . Same answer as previous 2 times. So I spent 600 zar on a Christmas present, which my son still not has? That was his only gift... Where do I go and what do I do? Hopeless situation. Of course the manager again (like previous 2 times), is not in store. Finally the girl agrees she will phone her manager who is on leave. On the phone he promises me that he will get himself a new one from the factory and deliver it to the Makro store next week (thought there were none left??). " Ma'am, we have 6 in the factory and I will reserve one just for you." I left the product once again with them but I have lost all faith in them and doubt it they will give me a new one, it's probably a fixed returned one. I hate it when you're so dependant and also really cannot do anything else than keep complaining and coming back. I really hope they give a new one or return the money, because my son still does not have his Christmas present and I lost 600 Zar and faith in customer service of both Verimark and Makro.