Have you checked out the relevant Wiki pages, quests, maps, videos, guides, walkthroughs & hidden gifts/bonuses.
Personally I find it much easier to consult, study & follow the maps in certain scenarios instead of the videos.
Mines, Maps & Videos
If you are still stuck....then i suggest that you contact Pixel support directly.
You can contact Pixel support directly through your game settings menu
Alternatively you can contact Pixel support directly via this link
Do not type in the white search box ... go to the categories written in blue.
Remember to check your spam / junk folder for replies.
Do not send multiple Pixel Support tickets in quick succession or their spambot could eat them.