Uber recently admitted that it made a mistake in how it calcuates its commissions for its drivers. As a consequence, it has underpaid drivers to the tunes of tens of millions of dollars for nearly two and a half years. (The mistake was Uber taking its cut from your gross ride fees before taxes, not your net fees; this seemingly inconsequential difference - $2 or so a ride - has added up to millions of dollars it owes to drivers like you.) This has happened in states such as New York and possibly Massachusetts and Rhode Island.
Likewise, Lyft has allegedly been charging an "interstate highway fee" - to the tune of 8.875% for trips taken between New York and other states and not compensated drivers for this. Although Lyft denies the charges, and some people familiar with the matter say drivers have been compensated, make sure to double-check if you're a driver in New York to see if you've properly received your wages.
Uber has agreed to pay drivers like you upwards of $900 if you have been working in New York City and possibly other states where sales taxes are taken for ride-hailing rides. Lyft has not agreed to pay any monies to drivers, but the issue continues to be a matter of dispute.
If you feel you're owed money, look at all of your ride receipts, calculate your fees (and see if they match up with what Uber and Lyft have been paying you), and reach out to the ride sharing companies to see if they owe you any back monies. You might have to make a few phone calls but it is worth it especially if you are owed money and the companies have agreed to pay you back (well, Uber at least).
Make sure to always calculate you own fees and see if they reconicile with what Uber or Lyft are paying you. They are big companies and sometimes make mistakes so you want to be on top of your earnings.