Bonus Abuse: Bonus Stacking

[lucks_maximus]

Has anyone ever been accused of bonus stacking by a casino? What caused it or what would cause it? 

"Bonus stacking is when you stack bonuses... or something"

It's not clear to me what that means: I received two bonuses from two promos which I thought could be considered to be stacking, and so I was going to forfeit one, but after checking with the casino (case escalated beyond service agent) they said it's okay to use both.

Both promos were for slots and both paid out in bonus funds (1x wager req.):
#1. Cashback on Wagers (slots)
#2. A Contest (slots)
As you can probably see here, merely playing for the contest accumulates cashback. Maybe if I end up winning a prize on the contest (which I did) and use both bonuses, it would be considered bonus stacking... is what I  thought, but apparently I was wrong. The casino responded to my inquiry by stating both can be used and I need not forfeit either one.  

If this isn't bonus stacking what is? Is the fact that one of the bonuses was derived from a contest what is excluding it from being considered bonus stacking?

Shirley I won't later be accused of bonus abuse when I explicitly inquired about this exact scenario  

I'm confused. Confuzzled, even.

[Afi4wins]

If you have 2 bonus promos, you can use both of them but only ONE AT A TIME. Depositing again to claim the 2nd promo would usually cause an error message, indicating a bonus is active and the 2nd bonus cannot be activated.

Any live chat host that says you can claim 2 bonuses at the same time is talking BULL! They do not know the rules!