You can switch to desktop, as you are right, the desktop has way more features than the Online version. Here are the instructions and also a link to customer service. If you explain your situation, you may be able to get a refund for the Online product you paid for, but you will have to call - no billing support happens here in the Q&A forum. You may opt to contact support first.
How to switch from TurboTax Online to TurboTax Desktop
[Edited 03/10/20 | updated links]
