Mass Effect 3 Multiplayer credits cheat

So, today I played a match on Bronze and it was weird. I was on Firebase White and inside the base there was a wall between first and second floor (there should be stairs there). Second I noticed music still playing quietly in the background, music you hear while searching for games, and third, waves were over almost before they started, but I though nothing of it. When I exited lobby I noticed this crazy amount of money I had. I restarted the game, but it was still there. I thought it was a glitch so I bought myself loads of packs. Later, I googled this and found out host was cheating. You can even get banned for spending those credits! I don`t remmember who the host was and I admit, I spent that money, not all, but some.

I don`t want to get banned. It took me 2 years of waiting for the game to become cheap so I cound buy it. I really don`t want to get banned. I read that support for this is no longer active and I don`t know what to do. Could someone help?

P.S. Sorry for spelling and grammar errors, English is my second language