It said I would receive my refund on February 24 but I did not receive it

What said you would receive the refund?

If you are referring to the TurboTax Tax Home page, the date posted is only an estimate.

Only the IRS and your State control when and if a Federal or State tax refund is Approved and Issued.

Once a tax return has been Accepted by the IRS or a State, TurboTax receives no further information concerning the tax return or the status of any tax refund. 

If accepted by the IRS use the federal tax refund website to check the refund status - https://www.irs.gov/refunds

If accepted by the state use this TurboTax support FAQ to check the state tax refund status - https://ttlc.intuit.com/questions/1899433-how-do-i-track-my-state-refund

After the tax return has been Accepted by the IRS (meaning only that they received the return) it will be in the Processing mode until the tax refund has been Approved and then an Issue Date will be available on the IRS website.
See this IRS website for federal tax refund FAQ's - https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions

Yes, the estimated date of refund is an estimate, not a promise. It is an educated guess based on the experiences of most people in the past. 

If you are talking about your federal refund,  you can track your refund using the Where's my refund? tool.