Volkswagen pinetown

I bought a caddy crew bus in february 2018 within 10 months second gear was making a noise .I reported it and it was taken for test drive they prove it and booked it in for gearbox repairs. It was with them for 3 weeks and pretend they fixed it but the noise was still there .this been going on from that time till today and now is reaching 60000km.3 of their technicians has proved the problem every time I book for service and I have warranty I paid for. The service is absolutely pathetic and the manner they handling this issue is so unprofessional.they blame each other for they incompetence .