It has been over 3 weeks since I filed my return and still have not gotten my refund. When I check the "where's my refund" it refers me to tax topic 152.

That is a generic message ... your return is being processed and it may take longer than 21 days ...

https://www.irs.gov/taxtopics/tc152

If over 21 days since being Accepted by the IRS and the tax refund is still Processing you can call the IRS and speak with an IRS agent concerning your tax refund.

Call the IRS:  1-800-829-1040  hours 7 AM - 7 PM local time Monday-Friday

When calling the IRS do NOT choose the first option re: "Refund", or it will send you to an automated phone line.  

So after first choosing your language, then do NOT choose Option 1 (refund info).  Choose option 2 for "personal income tax" instead.

    Then press 1 for "form, tax history, or payment".  
    Then press 3 "for all other questions."
    Then press 2 "for all other questions."  It should then transfer you to an agent, but there is likely to be a long wait.