Poor communication and delays

I am not happy with the service I received from Jessica Mshumi, she asks a question on the email, when I reply, she just keeps quiet and come back after days to ask another follow up question. I have been waiting for my books for three weeks now and I’m getting late with my assignments. When I called to check, they say my books have not been dispatched because they are waiting for one that will take 8 weeks, yet I told Jessica to send the available ones because the missing one is for next semester. Another thing, there is a risk book that I told her on the email that I need the one for the year 2022, she did the 2018 one, what must I do with an old book?