And where are the guarantees that tomorrow you will not change the rules again? To what date do you need to submit reports for the past weeks?

You can submit reports till the day sales officially start (25 october 2017). We can guarantee that everything will be counted and rewarded.
Everything we do is to provide our supporters with the best possible quality.
In Facebook Campaign step 4: Make 1 post per week with links to all your shared posts, my question is what is the starting day for this every weekly report? what is the range of very week?
The start of each week is Sunday and the end is Saturday. The report should be posted on this thread on Saturday, which should include links to all your likes, shares and retweets for the previous week.