Let me see if I have this figured out. First, your complaint is that you asked an employee where the humidifiers were, she stated they would be in one location, but it turns out there were in a display location. Basically, your issues is that the employee did not know where something was. Okay. Please understand that large stores, like Target, have people that work in specific departments. Usually only the managers are required to know all the departments. My guess is you saw her walking by, asked her about a product in a department she does not work in, she knew from memory where the humidifiers are usually kept, but they ended up being moved to a display area. You can't blame the employee if they do not work in that department that they did not know about a new display area.
Second, your issue is that the cashier told you to swipe ahead of time. If you felt uncomfortable doing so, then don't. Because I know Target's credit card machines move super quick, I alway make sure the total comes up right before putting in my card. That is your right to do so. And please don't give me some lame excuse like "I felt pressured."
Third, you called and asked what manager would be on duty tomorrow. The clerk told you two times she did not know. For all you know, they don't have schedules in front of them. If the clerk you first spoke to was off the next day, why would she know this information. You also have no idea what it would take to get the information. This could have required that she walk to the otherside of the store, which she may not be allowed to leave the customer service counter.
Finally, your issue is that the second girl you spoke to did not know the last name of the district manager. Why is this so hard to believe? I worked in four retail stores over the years, and I had no idea the first names of the three of the four places' district managers. The fourth one I know her first name, but no idea her last name. Besides, even if I did know, I would never, ever tell a customer unless I had permission to do so.
Basically, your only valid complaint is that the cashier rang up your items wrong, which needs to be correct, and I hope it does get corrected. All the rest of your complaints are fluff, BS issues. I'm going to guess you either have never worked in retail, or you have never worked in a retail store with seperate departments. Years ago I worked in Circuit City in the computer sales department. If you had come in and asked me about a cell phone or a TV, I would have had no clue and recommended speaking to someone that works those departments. Besides my department's manager, I never knew what general store managers would be working on a given day, nor did I know the first name (let alone the last name) of our district manager.
Like I said, I hope you get your refund back for the fact that the cashier rang out your stuff wrong, but the rest of this is fluff and you need to get over it.