I'm assuming by your comments about him growing that he's a puppy, perhaps around 4-5 months old, at most? It sounds to me like he's both playing and pushing his boundaries, much as he would with his mom and siblings if he were still with them. That's how he figures out what is acceptable, and what isn't. Hard though it is, you'll have to try a method and stick with it, firmly and consistently, for it to work, and it's likely to take a while, unfortunately. He's learned (at least it sounds like it to me) that if he's persistent enough, you'll relent and give him what he wants - peanutbutter in his Kong, or attention. Make no mistake, for some of them, negative attention is almost as desirable as positive attention - attention IS attention!
I would google "Nothing in Life is Free For Dogs", and give that a try. Like any child, he needs boundaries, and you'll have to set them for him. Once you've decided what is and isn't acceptable, you have to stick with it - every single time! - or he'll very quickly learn that "no" means "maybe" means "oh, all right, just leave me alone, will ya?!" They are the smartest of dogs, and the most stubborn/persistent! Good luck getting into a more helpful obedience class with him... Despite the difficulties in training, enjoy his time as a puppy - it goes by way too fast, and before you know it, he'll be a senior citizen...