Hyundai not customer friendly

In 2015 I bought a new Hyundai IX35. Since the first service I have complained about the gears and only on the 75000 they did acknowledge an issue and did a repair which resulted in 1st and 2nd not being functional. Was told to drive it as it would require a replacement, as it was difficult drive I took it back and waited for a very long time until technical said that it needed to be replaced and another 21 days for it be completed as they are waiting on the gearbox from overseas. Two weeks later I was called to collect and there were told they decided to fix, took it back again as I still experienced issues and was tested and now again told it has to go back to technical. This has been going on for more than two months now.