"You can contact me on this email to discuss this matter further." Is this sentence wrong? We are practising to write a complaint letter to a company where we bought a product. To end the letter, my friend wrote: "You can contact me on this email to discuss this matter further." 
"On this email" Oh, I've never seen it before so I think it is wrong. 
What about your opinion? And if it's wrong, how can I fix it? 
Thank you :*