I see. Please, there is no need to caps or to look for a phone number to tell that. I see your screenshots and everything is ok with them. I also see the situation with and without premium account.
The game uses FTP model. It's not broken. High levels are always not the best way to make credits. But still there are options how to make game more convinient on any tier: Special and permanent camos, Flags, Premium account of course, Missions and events. In random type of battles you receive more credits and XP for each battle if we compare to Co-op. In other way you may reduce spendings if you buy only what's needed for a certain ship.
We do watch all server stats not to have economicaly unballanced ships. And we always make changes if it's needed and always mention them on our game Portal.
Also we don't have cheats in the game. It's impossible to make 7 salvos instead 1 on the same ship like you mentioned above because almost all mechanics are run on our servers.
Sorry to say but we have a small number of forbidden mods, but the life of such accounts which use them is not long. They usually receive 1 warning and then they are banned for 7 days first and permanently for the second time. All announcements and rules may be found here https://forum.worldofwarships.com/forum/248-rules-announcements-and-discussion/
I can't tell you phone number, but you may PM or try to send a ticket to our support once again here: https://na.wargaming.net/support/en/products/wows/my-tickets/
Thank you for your feedback.