Shocking disregard for customers

Shocking service from UPS. I have spent the last 2 months emailing every contact possible at UPS, including our designated Sales Person, with regards to outstanding queries. I eventually resorted to emailing the MD a month ago, who has not responded in any way. Clearly not one single person at UPS has any regard for customers. It is unbelievable that not one single manager had the decency to respond. I have no words as our emails clearly have entered into a void empty space somewhere on the UPS email server. Totally shocking. The UPS call centre in South Africa prove to be unreliable as 4 different operators will give 4 different answers.