Requests to change language preference ignored!

I purchased a vehicle in February 2015. I opted for the English correspondence benefit. To date, I have only received correspondence in Afrikaans, despite my having written confirmation every time I request this change (on a monthly basis), that it has been done, IT STILL REMAINS UNCHANGED. Instead of lying to me every month, in writing, why not just tell me that I am not worth the trouble and your company is not prepared to grant my wish for my correspondence to be in English!!!!!! I am totally disgusted in your lack of customer service. What on earth are you paying your staff for if they are unable to comply with my request, yet are able to send me useless letters confirming that it has been done??? Please do not insult me by calling me to make more excuses and false promises. JUST FIX THE PROBLEM!