OK, it's unlikely, but look at your Order History & verify the version of SimCity you purchased. I have seen errors like this before, but only when an expansion pack was purchased, instead of the base game. But I don't think you can do that on Origin, and customer service should have noticed that. Still, it's worth checking to be certain you didn't accidentally get just an add on pack.
We've now reached the part where you will need to uninstall Origin "the hard way". I'd also like you to delete the SimCity game files & folders from Program Files and My Documents, if there are any there. (If you don't want to completely delete them, you can just rename the SimCity folders as a kind of backup)
Also, this will not affect your other game files, but to be safe, make a copy of your other game folders. Put the copies somewhere like your desktop, so you can easily find them.
Before you do the uninstall, please send a copy of your current InstallLog.txt to your reply. It will be found in the C:\Program Files (x86)\Origin Games\SimCity\__Installer\InstallLog.txt
Then, follow the directions for "the hard way" uninstall here: https://help.ea.com/en-us/help/origin/origin/manually-uninstalling-origin/#hard-way
I know they give a lot of cautions & it sounds scary, but if you only do what the instructions tell you to do, this will delete all of Origin from your computer & affect nothing else. If you run into any questions, ask here & I can talk you through it