Here are some things to try if you think your account is being hacked:
1. Find the "sign out everywhere" button in your settings and quickly change your password so that the hacker won't get back in.
2. Turn off Bluetooth (stops some parts off Spotify connect)
If these suggestions don't work then you may have to get in touch with Spotify staff.
If this still doesn't you may have to delete your account.
Hope this helps,