Answer:
Cheating and talking and passing papers
First of all, you should gain an understanding of their level of English, many non-native Speakers actually have a native level of English.
If you feel that your speaker struggles to understand you, you should speak clearly, not use slang or short forms (cannot rather than can't, going to rather than gonna) and use more simple words.
Answer: It's true, this is an example of consumer misbehavior, however there are some factors to consider.
Explanation: Although it is pretty evident that Michelle bought the dress in the first place because she liked it, what was done afterwards can be labeled as misbehavior for her plan to have the money back despite the article she already used for the ocassion she planned to attend with it. However, the cashier plays his/her part with the story because there is no evidence of refusal coming from what Michelle intends to do.