Horrible experience

So last week my mom and I went to Mugg and bean Carlswald for breakfast as we usually do twice/ thrice a week, I've been meaning to post however I've been away and only had a chance to now.

Roughly on Tuesday last week, we had our normal coffee and a little breakfast, lately we've been experiencing really slow service and did bring it to the managers attention and he just casually said "sorry" but not much of an improvement whenever approaching him. After our meal we asked for the bill of which the waitress brought to us, she took really long to bring the card machine so I paid cash, the bill came up to R186 if im not mistaken and I gave her a R200 note and some coins I had laying in my purse, I placed the note under the slip (wrote how much was on the slip) placed the coins on top and as I was walking out I handed the bill to her, my mom and I went to spar that was next door and as we returned back to the car the waitress came running and shouting towards me saying that I didn't pay and I only left her a tip, take note that there was people all around me. I looked at her quite embarrassed and told her that I did and she opens the booklet asked where abruptly, so I took it and picked the slip up where the note was peeping out (I could see it from standing across from her) and said "so what is this" and she rep**** with an "oh" my mom was absolutely furious and went in to the manager where she heard a customer making a remark, she didn't say anything to them although she was upset when talking to me about it, she approached the manager who was at the coffee station and I was by the door, my mom told him off as she was rightfully upset and explained what happened and he just smiled and said okay sorry. It was his attitude and tone that was just not interested.

I don't think he had a professional approach and the from the waiters side that was UNACCEPTABLE!!!