ID theft and how IRS handles
https://www.irs.gov/individuals/how-irs-id-theft-victim-assistance-works
Small Business tax help
https://www.irs.gov/taxtopics/tc103
Paying your taxes and making sure the IRS gets your money
https://www.irs.gov/taxtopics/tc158
When, where and how to file your return with the IRS
https://www.irs.gov/taxtopics/tc301
Record keeping and retention
https://www.irs.gov/taxtopics/tc305
Premium tax credit
https://www.irs.gov/taxtopics/tc612
IRS notices and what to do
You mean doing nothing hasn't helped?