I tried once last year to buy some MF stuff from KEH. I also didn't get any answer when wrote them Email. Then on other forum I was told by people who regullary buy from them, they do not answer Emails untill you make order and payment. After that they are good in communication. Atleast that is what I was told. I chose not to buy there, but they still are considered as one of the best places to buy.
I was also told it is better to call them, than to write Email, so be persistent in calling untill they aswer (hopefully)
Good luck