Bad service and no response

I receive performa invoice make payment. I receive call from Linda Pillay informing me my study material would be dispatched within 7 days. It’s already Almost 3 weeks later going to a month since she called and nothing still. In April I have assignments due. Wen will I get time to study. Bad service I’m receding from mancosa. I call I don’t get through. Send message on chat no response. Emil Linda no reply. I’m beyond aggravated.