As Wes above/below - anything that is account based - i.e. licence issues, duplicate purchases etc. - a ticket needs to be logged with Support. They are usually pretty prompt in replying to you if they can (a) get as much detail as possible form the user; (b) Recreate the issue (if its a bug with the software), (c) access your account without issue to clarify payments etc.
If you bought Studio One last November (November 2019) then it would have been valid for Version 4 (Artist/Pro, it does not matter). Sphere includes (among a wealth of other stuff like Notion) access to a full licence for Professional V5, both of which were released in July of 2020. There is an upgrade method to upgrade your account from Studio One v4 to Studio One V5 as a perpetual licence, which is discounted.
If you bought your licence for V4 in November 2019 then you are not entitled to the grace period upgrade. If you only OWN a perpetual licence for S1 V4, but have used S1 v5 as part of your Sphere membership then you should be advised that songs and projects saved/ completed in V5 cannot be opened in V4. (This is not a fault it is standard fayre when Studio One upgrades.)
The only way, as I understand it, you could possibly have paid twice for the same thing is if you bought a perpetual licence for S1 v5 AND THEN Sphere. If you only bought a perpetual licence for V4 and then used Sphere for V5, then you have only rented Studio One V5, Notion and the included bundles. You paid for V4 but subscribed or rented access to V5. ( For example - I paid for Notion, S1 upgrades, Mai Tai, Fat Channel Vol 1, so it was not cost effective to use Sphere for me.)
You have not paid twice for the same thing, by the sounds of things, though. Also if you do not like Sphere then when you cancel your subscription you will lose access to everything included in the membership that you don't own. I believe there is no notice period for cancelling your Sphere membership. However there is "Sphere exclusive" features that you will lose as well as your software. Those special video sessions by Gregor or Joe, that us "non-Spherical Users" cannot access will be gone. So will the collaboration tools and the cloud. (However you can pay for the cloud storage as a separate item, I believe - I don't use it.)
If you have paid twice then it was for two separate products - first you paid for Studio one v4, then you paid separately for a sphere membership, which included the new version of S1. S1v4 and S1v5 are different products.
Please note, if you have decided to cancel your Sphere membership then you will lose everything you don't own. Notion, All the instruments for Notion, Fat Channel Volume 1, all Mai Tai and Presence presets, Impact construction kits, Sample packs etc. The only stuff you will keep is whatever is associated with your S1 v4 licence and anything you have gained before that time or purchased separately from Sphere.
