Unsatisfactory customer service

I struggle since August to get proper service from Volkswagen Bethlehem. I contact them twice via the website, and everytime I mention that they mst please contact me after 15:00 because I'm busy at the school. But then I received calls during the morning, which I couldn't answer. I send them another message, this time in Afrikaans, where I also asked them to respond via email, but since now, nothing happened. It seems that no one there understand Afrikaans. The reason why I communicate via the website, is because I am deaf. There is also no email address on the website where I can contact someone directly.

My car is due for a service since August. (still on warranty)

What must I do? I'm staying in Senekal and can't just drive to Bethlehem to make an appointment.

Please fix your customer service!