Teenage discipline

Here is a question for all you moms out there. What sort of punishment/consequences do you impose on your teenage children? Our son is already under tight supervision because of a lack of trust and his refusal to follow rules. He has to earn screen time based on getting his schoolwork and chores done daily by 4PM and only gets his cell phone once all of schoolwork is finished. It is taken each night before bed and kept by me until the next day.

Here is the current situation. My 14ds was told to be home by 5:20PM and was told before he left not to text or call asking for more time. He texted me at 5:15 (which I did not receive until later) asking for 30 extra minutes. He did not text back again until 6:30PM, this time asking how much time he had left. I told him he was over an hour late and told him he should have called me or come home when he did not receive a response to his text. He finally got home and I gave him his punishment-being grounded for 2 days, one day per 1/2 hour. He is grounded from friends and his cell phone for that time period.

He immediately launched into an attitude and tried saying he had texted me, but I had not texted him back (implying it was somehow my fault). He then tried telling me it took him 30 minutes to find his friend and another 30 minutes for them to fix something, so he should not have had to come home after the hour was up. I told him he was going to do dishes tonight as his punishment for the attitude and it just got worse from there. We took the dog for a walk and he argued the entire way about the unfairness of it all (and the fact that he NEEDS the bigger room when we move. Hello, how does that relate to the current topic?).

After we got home and he ate dinner he kept trying to get out of doing the dishes. He tried offering to do the dishes Monday, Tuesday and Wednesday instead (Monday & Wednesday are his days anyway), and then switched to arguing about how tired he was and that he just wanted to go to bed early. He finally went in to do dishes, only to lie about using hot water. I told him he was to wash all the dishes on the counter and unload the dishwasher, meaning for him to wash all the dishes, not just load the dirty ones into the dishwasher once it was unloaded. It was more of a principle thing-having him do the harder job of hand-washing all the dishes. He refused and ended up putting most of the dishes in the dishwasher.

I decided to not say anything, but went into his room and took the speakers my husband let him borrow. He noticed as soon as he went to his room and came down looking for another arguement. I told him that since he decided to disobey me I took the speakers back. My thought now is to have him unload the dishwasher tomorrow at lunch (our normal chore time) and he can hand-wash all of the dishes like I told him to tonight. Any thoughts?