Is there an equivalent for the Cantonese phrase "M Goi"
M Goi is written as 唔該 which in simplified is 唔该 or Wú gāi in pinyin.

The only thing I can think of that may be similar, although it definitely doesn't mean thanks is 劳驾 Láojià which you could use for "excuse me" or "hey" but not for thanks.