very,very bad service

Good Day

Kindly assist with how to log a complaint as it is frustrating for me to continuously do follow ups on a matter that has taken me two weeks to ask for assistant in regards with an tax invoice that i need to provide to my HC so that they could process the payment and still awaiting for it even now but i guess it is difficult to get one because with several communication with Shazia but failed to get any help with constant promise of feedback .the closing date was yesterday of which i also emailed their student support but didnt receive any help and further don't understand why everything it has to be done by the head office whilst we have designated johannesburg that is always available to help when help is needed.I cannot go to school this year because of someone not being realiable enough to provide me with a simple tax invoice

Regards