Single missions are not so popular and the ones I've played all seem a little peculiar. I've not played that one. I suspect these possibilities:
1) There is a particular ship(s) in the convoy you need to sink.
2) You need to take out a particular tonnage total (even if it means sinking all the largest ships, or sinking several ships from several convoys.)
Suggestion: Go after only the largest ships and sink them all.
The more far-fetched possibility is you have not identified the correct convoy, but from my experience so far, the game will throw several candidate targets at you until you get it done.
-Pv-
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