Unable to change my phone number.

 
I tried changing my phone number which I changed many years ago. I am supposed to send a code from both my old number and my new number but I don't have the old one any longer. How do I solve this problem?
 
MegaProfit V7:
I tried changing my phone number which I changed many years ago. I am supposed to send a code from both my old number and my new number but I don't have the old one any longer. How do I solve this problem?

Only the Service Desk can change it for you:

Reason: