Totally Unacceptable Service - DISGUSTED!!!!

I submitted my sons test and task via courier on the 29/03 and it was signed for by an Employee by the name of Gert. I have been sending emails and calling and speaking to numerous employees and no one can give me a straight answer. To date there is still 2 x Task and 1 x Test outstanding. I have made numerous calls and logged emails with various reference numbers. There call center agents and assessment department just close off queries with out giving the customer final feedback. I am at my wits end with Impaq this year. I have not received such bad service from them since my son has been enrolled. Can someone in a higher authority get in contact with me as to what we are going to do regarding the outstanding tasks/tests. Student: 50214 my contact number: ***