IRS hasn't processed my 2018 taxes after sending them twice.

How can I get in touch with someone at the IRS to find out whether or not they have actually begun processing my 2018 taxes?  I sent my 2018 return late in March 2019, sent it UPS, and I received delivery confirmation according to the UPS tracking system, but there's no evidence that the IRS is actually doing something with it.  I sent it a second time 2 weeks ago, again UPS, and UPS says it's been received, but again no evidence of that. 

What do I do?   I already created a my account on IRS.gov and I've been checking daily for weeks, but nothing.


I paid a lot of money for my 2018 tax software - over $100 - and I can't get to anyone live to ask a question about why my taxes haven't been processed and what I can do to get around this to process my 2019 taxes.