Challenges that are so circumstantial don’t even work

Hi all. I was on the last challenge for the tea skin, which I quite like, and the challenge didn’t complete despite completing the objective. I needed to blow up three warthogs. Got one in one match, got into another and finally managed to blow up another two. Killed them with the wasp, got double kills and killjoys. Got the other with grenades. But apparently blowing them up doesn’t count as destroying them. I’m so frustrated and angry cus I’ve spent so much time doing this challenge and it doesn’t even work. These challenges are completely unfun and flow against the game. I had more fun weed whacking than playing this games weekly challenges. Has anyone else had broken challenges?