you should try to log into OTP web homepage and check if you can change your number, then reset the otp on a new device, it will cost you 5Kc in order to reset OTP, so in anycase you should buy some, I suggest you in this case to use PaysafeCard if you can, since with this method you are able to gain your KC istantly, otherwise other methos would take some day in order to get your KC.
I think you can log in ICS/OTP by using your email only... now I really cant remember.
try, the website is this
https://otp.nttgame.com/
Edit:
No, sorry you cant.
I just checked and is not possible to login, for log you need your otp code, or a mobile authentication, this last one is not possible without your old number >.<