Treat customers with respect

I would just like to share my experience, I am so disappointed with the service received and had it r a friend I would not be typing this complaint as I have been a customer of Dischem for so many years but to be treated like a ***** was a real eye opener. I went to Dischem as always this weekend - I got what ever I need and when I got to the till the service was terrible because i was speaking to the cashier who had no interest in what I was saying- I provided her with my meds and told her that there are 2 slips and I advised that we will be using 2 cards to pay. When we were done paying not me nor my husband questioned anything or checked, anyway today I get a call from the pharmacy - A lady by the name of Elaine calls says that there was a slip missed during payment and explains that they picked it up, throughout this conversation I am calm and I even advise her that I will be at Dischem on Saturday so she can send me the slips and I will make payment but what really got to me is the fact that the more I say that its no problem and payment will be made the more she says that she has me on camera like I did something wring when none of this was my error and i did not dispute anything - 3 times in one conversation im told about footage - seriously , I could have just said I am not going to do anything as it isnt my faulty but not once did I even disagree - To be such a long standing client and treated this way is horrible and not to mention many times Dischem forget meds and we have to call even now there was some meds short from last month which is still owed but not once do I get rude. I am in the customer service industry and this is not service - I think I will take this further especially the behavior of so called Elaine who has footage but cant pin point the till I was at so she asks me to tell her which till I went to.