I had such a disappointing experience with my first online purchase and I really do not understand why I would be treated so poorly

I had such a disappointing experience with my first online purchase and I really do not understand why I would be treated so poorly. Firstly the garden hose that I bought was split from the rest of the order and never delivered on the said date. I had also requested a refund for the tank as Inwanted to buy a bigger one and that process was just ignored. I also wanted a different coloured toilet seat and I ended up taking the toilet seat to the store myself. I had to wait long at customer service while multiple employees tried to process the exchange as they struggled with it. They eventually gave me a voucher and I almost didn’t get the colour that I wanted, because the price had changed and they wanted me to pay more money, which didn’t make sense to me, because it was an exchange of the same item.