I am on SSDI and was told I would get the tax preparation for FREE. I finished the preparation and being charged $120.00. I am getting no money back and owe nothing being under the total tax burden. I

You strayed into the wrong program.  You are posting from a paid version of the software called Self-Employed.  If SSDI is your ONLY income you could use the IRS non-filer site.  But do NOT use this site if you need to file an actual tax return,

https://www.irs.gov/coronavirus/non-filers-enter-payment-info-here

If you receive any other income in addition to the SSDI you may be able to use Free File.

If you qualify to use it, there is another full-featured free version of the software:

Try Free File: 

You qualify if your income was $36,000 or less, or $69,000 or less if active duty military, or if you qualify for Earned Income Credit

https://ttlc.intuit.com/questions/1900583-what-is-turbotax-free-file-program

• https://ttlc.intuit.com/questions/2026912-how-do-i-switch-to-turbotax-free-file-program

Note:  If you do not qualify to use Free File then you will have to upgrade to Deluxe or higher in the paid versions of the software.   

Online Deluxe $60  State software $50

Or—-Use this IRS site for other ways to file for free

https://apps.irs.gov/app/freeFile/