Young Basenjis have so much energy, and you have a teenager! A teenage Basenji needs lots of exercise. I walked Spencer, but that wasn't enough when he was young. I had to take him to the dog park and let him run, run, run offleash. On weekends, I would take him to a nearby school and he would race from one end of the playground to the other again and again and again. (Unfortunately, they now lock the gates, so there goes that great solution.) Exercise is a must. A tired Basenji is a good Basenji.
Good training will do wonders, too. Spencer did not excel in puppy class. He started puppy kindergarten at four months, and he was by far the unruliest dog in the class. We flunked. He would sit and lie down for treats, but he wouldn't heel or stand quietly by my side. At six months, I got a really good trainer, and it made all the difference. Every dog trains at his or her own pace, so sometimes, you have to respect that.
Exercise, training, gentle but firm discipline and clear expectations will help a lot, but the biggest help of all is time. Acceptance helps, too. Basenjis have selective hearing and a mind of their own. Sometimes, it's easier to change our behavior than theirs (keep trashcans tightly closed, clothes out of reach, crate him or put him in another room when you're eating). I'm no expert, but my wild puppy grew into an amazing dog, and yours can, too. Good luck to you both!