If you are delegating SP, currently the only option to un-delegate is with the blockchain API. If you do not know how to use this, then you likely will not be able to get this SP back unless/until a third-party tool is developed that allows you to un-delegate.
Please help me with this as I created an account and then wanted to remove the delegation, 16 days have passed and my SP is not returning. I'd like you to please tell me how to get it back!
The delegation return period for new account creations is 30 days instead of 7.
Thank you very much for your reply. It's a relief to know you'll be back!