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If you missed out on last week's free Slurpee day, don't despair. There's still time to get one, and other free items, in the days ahead.

7-Eleven's week-long birthday celebration was interrupted Saturday due to technical difficulties with the company's phone app.

The promotion, which consists of daily coupons for free snacks, has been pushed back and extended by three days. It will now resume Tuesday and run through Thursday, July 24.

The promotion started with Free Slurpee Day on July 11, a birthday tradition the company has had since 2002. This year, 7-Eleven planned to continue the "party" by giving away free items through the following week. To redeem those offers, customers were told to download the 7-Eleven app to access coupons.

A free "Big Gulp" soda was the first phone app giveaway, but halfway through the day on Saturday customers encountered issues accessing the coupon. Some voiced their complaints on Twitter.

"@7ElevenCares I downloaded the 7-Eleven app a few days ago. The barcode for free Big Gulp never appeared July 12 :(," tweeted @teslastrong.

"@7eleven downloaded your app, no bar code with the offer for free big gulp. Left my big gulp and other merchandise on counter and walked out," @franknovakPR tweeted.

The high volume of people trying to redeem the electronic coupons caused the issue, according to 7-Eleven.

"Yes, because of the high demand for our 7-Eleven week offers, we experienced some technical difficulties over the weekend with the offer section of the 7-Eleven App," Margaret Chabris, 7-Eleven's director of corporate communications, wrote in an e-mail to USA TODAY Network.

7-Eleven temporarily shut down the program shortly after realizing customers were not able to access the coupons, according to Chabris, and worked to respond to customer complaints through the weekend.

"After we learned there was a problem, we closed the 7-Eleven Week offers until we were confident we could provide them again," she wrote.

7-Eleven announced the following new promotion schedule:

July 15: Free Hostess® Twinkie® (single serve)

July 16: Free SNICKERS® or TWIX ® Brand Ice Cream bar

July 17: Free Quaker® Chewy® Yogurt Snack Bar

July 18: Free Pillsbury Cookie (all flavors)

July 19: Free Small Slurpee drink

July 20: Free Big Gulp® drink

July 21: Free M&M Birthday Cake Candy

July 22: Free Grandma's Sandwich Crème Cookies (3.0–3.025 oz size)

July 23: Free Big Gulp® drink

July 24: Free Small Slurpee drink

Follow @lagrisham on Twitter

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