I redeemed a 12-Month Gold. It came with 4 months free Game Pass Ultimate. After 4 months,...

and when i redeem a 12 month game pass card it converts to 4 months i basically get scammed

Are you sure it wasn't a Live Gold card? As I have seen before (I think) where 12 months of Live Gold gets turned into 4 months of Ultimate Games Pass.

If you currently have Game Pass Ultimate and attempt to redeem a 12 month Xbox Live Gold code, it will convert to a 3 or 4 month Ultimate subscription. If you want to continue with just Gold for 12 months and not Ultimate, you would have to wait for the
Ultimate to expire before redeeming the regular Gold code.

If you don't currently have Ultimate, then you should have no problem redeeming the 12 months of Gold.

No. If you pay in full 12 months of Game Pass ultimate, you'll get 12 months of Game Pass Ultimate. You'll only get 4 months if you buy 12 months of Gold or standard Game Pass and add that to Ultimate.

If you already had ultimate, and then redeemed your gold 12 month subscription, it would have automatically been converted to the 4 months on Ultimate. Conversion ratios are here.

[table][tr]1 month of Gold[td]20 days of Ultimate[/td][/tr][tr]3 months of Gold[td]50 days of Ultimate (1+ month)[/td][/tr][tr]6 months of Gold[td]79 days of Ultimate (2+ months)[/td][/tr][tr]12 months of Gold[td]4 months of Ultimate[/td][/tr][tr]24 months of Gold[td]8 months of Ultimate[/td][/tr][tr]1 month of Xbox Game Pass (Console Games)[td]20 days of Ultimate[/td][/tr][tr]3 months of Xbox Game Pass (Console Games)[td]2 months of Ultimate[/td][/tr][tr]6 months of Xbox Game Pass (Console Games)[td]4 months of Ultimate[/td][/tr][tr]12 months of Xbox Game Pass (Console Games)[td]5 months of Ultimate[/td][/tr][tr]24 months of Xbox Game Pass (Console Games)[td]10 months of Ultimate[/td][/tr][tr]1 month of Xbox Game Pass PC Games[td]20 days of Ultimate[/td][/tr][/table]

It didn't come with 4 months of Ultimate, it converted the Gold you added to 4 months of Ultimate. If you already have Ultimate on your account and you add a standard Gold or Game Pass code, it converts the time to Ultimate (since Ultimate already includes them) at a conversion rate based on the price rather than time. So the 12 months of Gold was converted to 4 months of Ultimate since a 12 month Gold is equal in price to Game Pass Ultimate.