If you were my mum what could i do for you to let me off lockdown?

What you could do is to actually take responsibility for your actions and Not do what you should not be doing. You will earn more respect that way. You have to pay the consequences of your actions. You don't have it too bad if she let you use the internet. No phone, no TV, but she is letting you use the internet? I some how don't believe that either.