This can be tricky..... if you are cancelling your policy early, you are ending a contract beofre the contract expired, kinda like your cell phone contract. There may be, or may not be cancellation fees. Some of the penalty come in the for of "short ...
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If you have been kicked out of Google and they refused to reinstate you, unfortunately, you cannot get the money you earned. Invalid clicks is a "catch all" term that they use and it can mean anywhere from clicking on your own ads, labeling the ads, ...