Poor Customer Communication / Unprofessional

I had a poor experience with Sky Map. The communication which is done over Instagram as its quote "the future" and emails are obsolete (Highly doubt emails are going to disappear - ever), was extremely unprofessional. I organised to collect an Item but the one time i was heading out of sandton to kyalami, they couldn't meet me. It seem silly to order delivery for something 12 km down the road. Anyway, on following up I realised that they werent even going to meet me half way, so I would have to get delivery. I am then told it will be R100. Now I can get postnet to postnet for R100 nationwide and pep to pep for R55, so naturally i asked about the high cost. I had previosul done business with them (again also really difficult communicating over instagram), and I stated I intended to do business with them further. I get a very defensive message back noting it is my fault, not the businesses and that i must read the instructions carefully and that i chose to fetch it. And please could i not say that its bad service on their part. I was shocked that they couldnt take criticism and could be so rude to customers.