Firstly, I know that there is a question on switching cards after charging rent on them. However, the case I did is a bit more extreme.
I had 2 green, 2 red, 2 light blue, 1 yellow, and a multi-colour wild property card.
Firstly, I moved the wild card from its original position, with the yellow, to the green and make it a full set. (This counts as 0/3 of my moves.)
Then, I charged everyone 7M each. (1/3)
After receiving the money, I moved the wild card to the red set, and charged everyone 6M each. (2/3)
After receiving the money, I moved the wild card to the light blue set, and charged everyone 3M each. (3/3)
Then, I moved the wild card back with the yellow card.
Is any part of my moves out of the Monopoly Deal rules? Although I don't think so, people are saying that I might have cheated.