Muhammad, Elance is being absorbed into Upwork. Having an Elance account will not do you any good in a few weeks when they stop allowing clients to post new jobs on Elance.
Having a suspended account is not the same as having had your account terminated. I suggest you follow the instructions provided and clear the suspension.
No, you may not delete your Upwork account, but you can resume working with it if you go through the the right steps.
If your account was suspended, which is the word you used, it can be un-suspended. Follow Customer Support's instructions that they sent you. If you can't find those instructions, contact them.
@Preston H wrote:
If your account was suspended, which is the word you used, it can be un-suspended.
Unless the user was told that it was permanently suspended. In that case it can't be
"Suspended" can mean temporarily, or permanently.
The OP needs to talk to Support to see if there is a chance of getting the suspension lifted.