Zando - Impossible to Unsubscribe

I'm trying to unsubscribe from the Zando email which I receive every single morning. I have unsubscribed 10 times now, they tell me they sorry to see me go but keep sending the emails. I have emailed their *** email address but get an auto reply with a service delivery issue I am now being spammed by Zando! I will now never buy from Zando again!!