Dug

My partner and I had already made up an unnatural canasta with five 5's and 2 wild cards. The discard pile was quite large and was frozen by a wild card.
Our opponents discarded a 5, but I had retained the other two 5's in my hand.
I said I was entitled to pick up the discard pile with the two natural 5's left in my hand, forming a completely separate meld to the previous unnatural canasta already made up. Was I correct in picking up the discard pile.