Well, I know this is going to be moved to the right section but I'll try you now that this won't get accepted. Excuses saying something was doing something bad on my account never turn out well and I doubt you'll get out of it through and appealing just saying how it wasn't your fault.
Your best chance is admitting that it was your fault by letting him access to it and adding onto that with some sort of apology and promise to be more attentive next time.