No customer care

I have purchased items from Shelflife before but recently I tried to purchase a sale item but I was being charged a R100 delivery because I was R3 short of the ridiculously high free delivery total. I understand all outlets charge different fees etc but being charged a R100 delivery fee for being R3 short and the next cheapest item is R80. Is just a way to con the customer due to clever pricing just as if I took an item for R799 I would be charged R100 because I'm R1 short. There is nothing on the website stating what to do in situations like these. I tried to reach out to share my concerns I was told it will be shared with management but 9 days no apology or response. I emailed again then I was told I should of asked of code etc but nothing of this was mentioned to me at the beginning. The tone of emails changed it was basically then you can do what you like we don't care. You buy or you don't buy we don't care. The motto of Shelflife