How to call for help if your voting rights are violated or you have questions about voting

If someone tries to stop you from voting, or you run into other problems, or you just have questions, there are election hotlines which may be able to help. There are nonpartisan lines in several languages. The Democratic Party also has an ASL video phone line and a texting line. The Department of Justice has several ways to report possible voting rights violations. The NFB has a line specifically for blind and low vision voters. There may also be resources specific to your state. 

The Election Protection Hotline  866-OUR-VOTE (866-687-8683) is nonpartisan. They’re run by lawyers who care about protecting everyone’s right to vote. They’re also affiliated with a couple of other organizations who have hotlines in additional languages. They work to make sure individual voters can vote:
Spanish/English: 888-Ve-Y-Vota 888-839-8682 by NALEO Educational fund 
Chinese, Vietnamese, Korean, Bengali, Urdu, Hindi Tagalog, or English: 888-API-VOTE  APIAVote and Asian Americans Advancing Justice-AAJC.
Arabic/English: 844-418-1682 Arab American Institute’s #YallaVote hotline 

The National Federation of the Blind has an election hotline for blind and low vision voters (nonpartisan): 877-632-1940 (November 8 from 7 a.m. EST to 7 p.m. PST)

The Democratic Party also has hotlines for voter assistance, including an ASL line and a texting number (I don’t know of any nonpartisan texting or ASL options unfortunately):
Voice: 844-464-4455
For texting, you can text QUESTION to 47246.
ASL voting hotline, 240-204-6475 on videophone (VP) There’s an ASL video about this hotline here.

You can also report possible voting rights violations to the Department of Justice. The DOJ is likely more interested in the overall issue than your case specifically — it’s absolutely worth reporting issues to them, but probably worth trying to contact Election Protection (or one of the affiliated organizations) or the party of the candidate you want to vote for first:
Online complaint form 
voting.section@usdoj.gov
Phone (800) 253-3931 (toll free)
Phone (202) 307-2767
Fax (202) 307-3961
TTY  877-267-8971

There may also be hotline numbers specific to your state.
For instance, in North Carolina, there is
Disability Rights North Carolina  877-235-4210 (888-268-5535 TTY)
The North Carolina State Board of Elections has a form for reporting incidents  and a guide to what is and is not acceptable from people who wish to observe or monitor the polls 
Local county boards of elections also have phone numbers, fax numbers, and email addresses 

tl;dr If someone tries to stop you from voting, or you run into other problems, or you just have questions, there are election hotlines which may be able to help. There are nonpartisan lines in several languages. The Democratic Party also has an ASL video phone line and a texting line. The Department of Justice has several ways to report possible voting rights violations. The NFB has a line specifically for blind and low vision voters. There may also be resources specific to your state.