Undermining service

I really don't know where to start. So my sister whose doing her matric this year asked me to get a book for her Impi Yabomdabu Isethunjini which is a grade 12 module. So I went to Exclusive books Sandtion City on the 28th of October and they had no stock but I was advised they could order for me and it will take 7 to 10 days. I agreed and i even offered to pay but i was told I would pay when I collect. After 10 days I went there to check if the book was there and I was advised that the book was actually ordered on the 01st of November and i was told to wait again. Went again on friday and i was told to wait again but atleast the lady that helped me was so helpful, she spoke to the manager and took my numbers. I was told the manager would call me on Monday the 15th with feedback. The manager called me on Monday and advised that she was unpacking boxes and she will give me feeback once she checks if the book is there. That was the last time I heard from her. So I went yesterday the 25th to check again and I find out the book was there from the 17th of November noone thought of telling me that the book was there even though I have been coming through to check and even left my numbers WOW. Oh well so the guy goes fetches my book from the back so when I tried to pay my card declined which I was confused cause had not reached my limit. I checked my app and everything was fine and I asked the guy to try again by it still declined which was a national technical problem with Capitec customers. Fine I asked for the declined slip and told the guy I'll come back with cash and left. When I came back logic you would find the book there infront because you said you were coming back but no the other guy had to go to the back AGAIN to fetch the book and I had to wait.

Now if it was my book i would have cancelled the second time I went to check but because my sister's and she needed it I sucked it up. I don't know if it was the undermining that got me ****ed off just treat all your customers that walk into that shop with respect and value their time.