Unprofessional attitude towards tenants

We received an overstated invoice for September 2015. I queried the billing with Donovan Randelhoff on 25/08/2015. He confirmed that he will be following up on the matter and come back with me a response. After many reminder emails, an attempt to have a meeting with him as well as sending him my contact number to discuss the matter (upon his request), I am STILL waiting for any communication (emails, fax, meeting, telephone call). Please avoid any dealings with Acucap as their staff is *********** and unprofessional.