Exceptionally BAD and non-existing Customer Service

ALTECH NETSTAR......I had 2 tracking devices installed 3 months ago. Since then, I have been incorrectly billed for 4 tracking devices, with additional costs of which I know nothing about. I emailed them on 28 November (on the email address provided on their website and inside their booklet), and I got a read receipt notification. I heard NOTHING from them regarding this query and so I emailed them again on 7th Dec......same thing......read receipt received but NO REPLY from Altech Netstar. Emails were sent to Consumer queries, so I'm pretty sure it went to the right department. I am DISGUSTED by their non existant customer service. I will be cancelling my tracking devices with them and will look for another company that actually want me as a client!