I have an adwords account which I want to cancel so that I can open a new one with the correct currency preferences. However, I don't have the account cancellation option. This is probably because I didn't enter my billing preferences as I don't have a credit card. Is it possible for me to cancel my account and open a new one by contacting adwords support?
It should be under the my account area, but as you said since you didn't enter your billing info it might not be there. But yea talk to them through live chat or call them and they will cancel it for you.
You don't need to cancel the first one to open another. Just open a second account and link them up using my client center. It's very simple to do.