Dissappointed with Game Purchased & Poor Service from Steam Support

I purchased The Sims 3 game from Steam, before purchasing the game they Steam told me they are going to add all the extension packs (they guaranteed me all ext packs added), and I purchased the above mentioned for the amount R6999.00.

I was so excited to receive the game and it was installed on my PC directly through the steam app and took approximately 12 hours, after installing I played the game and it went perfect the first day, I then loaded my saved games from my previous Sims 3 games and loaded with no problems, until I loaded a saved game from a Katy Perry Sweet Treats Ext Pack then the problems started.

The only thing that appeared when the Katy Perry Pack was loaded is empty community building and a message appeared that said some objects are missing, then I opened the Launcher (Menu) and a message appeared that said "Requires The Sims 3 Katy Perry Treats, meaning; there was no Katy Perry Extension Pack as was promised by Steam and guaranteed all ext packs was included in the purchased game,

I then emailed Steam Support and explained the problem, it took almost a day for response only to tell me, the following as sent by them;

"Hi there, Unfortunately, that DLC is not available on Steam and I do not see a purchase of that DLC on your Steam account.

We are unable to manually add content to your account especially if the DLC does not exist within the Steam store page.

So in other words I have to buy the Katy Perry Ext Pack only by the stores that are linked with Steam, Origin etc, for approximately another R1400.00 additional to the Katy Perry pack, after I was initially promised and guaranteed all the ext packs are added when purchasing The Sims 3. (so problem was mine all of a sudden)

If a person buys the game (linked on Steam app) why do they not tell a person these problems and fine print attached to the game if not finding what you anticipated to get.

Being very disappointed I then sent an email to Steam Support telling my dissatisfaction and wanting a refund, it's been 24 hours and no reply from them or assistance.

Regards