Hi, and welcome to the community!
Have you tried resetting it through the reset password page?
If you have and it still doesn't work, I suggest you submit an online contact form; and someone at Spotify should be able to reset it for you.
If you get an automated reply; make sure to reply to it directly (even if it's from a no reply); and it will be sent to the Spotify staff.
This post was by Taylor - I do not work for Spotify! If this solved your issue - Mark it as a solution! If you like my post - Please add Kudos! || Spotify Profile - Taylor | Feel free to PM me - Here ||