What is the difference between -지 말아요 and -지 마세요?
From what I have read and seen I think they are used with the same meaning but I might be wrong. Thanks.

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-지 말아요 mean -don't say it , while -지 마세요 mean -don't do it . it has different meaning :)

Answer

지 말아요/지 마라요/지 마요 (lol) are basically just the plain forms, while 지 마세요 Adds a respectful/'please' tone.

Ex- 티비 보지마요. "Don't watch T.V."
티비 보지 마세요. "Please don't watch T.V."

Both could be fine, but use ~지 마세요 to be safe C: