I never got my tax return for the last 2 years even though I filed. What happened??

how did you file  - a paper return. try to contact the IRS they are the only ones who could tell you why.

if you e-filed did you receive an acceptance e-mail?  if yes then again contact the IRS.

if you received a rejection e-mail and never fixed it so you got an acceptance e-mail then the IRS never got it.

you'll need to print them out and follow TT filing instructions. mail each separately. 

800-829-1040
First choose your language.
Then 2
Then 1
Then 3
Then 2
When asked for SSN do nothing it will ask twice
Then 2
Then 4
You should then be transferred to an agent, but there is likely to be a long wait.

you might experience a lot of frustration in calling the IRS. many threads about not getting thru or once thru got disconnected.