You bought that account and the previous owner changed the email before you could do it, I'm pretty sure mate that you applied for many signature
Campaigns with your account if not a bought one, managers are used to quote participants, if you could sign a message with an address which was
Quoted by a manager to the admin providing the link to the quoted post then you can prove that you are the real owner.
Look, I am already in bad situation. I never bought it from any one. It was my own account till day 1. And Yes, I have participated in many signature campaign. I am in negotiation with respected member to fix my issue. Please do not spread lies if you are not sure about it.
I joined 3 years ago. And I focused on mining. I posted very few and all of my posts were about mining altcoins by gpu. After few months, my gpu mining rig became faulty and I stopped mining and all related activity.
You are also a respected member. There are still honest members around you. I have no reason to cheat.