Redeemed a code, but got the wrong product

Hi,

Today I bought a 12-month Xbox Live Gold subscription from my local electronics store.

I redeemed the code on my xbox (like I have been doing for years and years without problems), but instead of getting a 12-month subscription for Xbox Live Gold, I got a 6-month subscription for Xbox Live Ultimate. The thing is, I don't want Ultimate. I tried
it out for a while (it was $1,- or something for a few months), but I rarely play the games from the game pass, and I'm just not interested in paying for the extra service. I can't find how to reverse this, and there seems to be no way to contact support or
anything. Any help in how I can solve this would be appreciated.

Kind regards,



:)