WASHINGTON — After long lines, glitchy ATMs and poor service during the Nationals’ Opening Day game Monday prompted online outrage, a team official says more customer service staff will be posted throughout the park and ready to step in.[related_gallery align=”right”]

“They are there to help resolve any issues you may encounter,” Alan H. Gottlieb, the Nationals’ chief operating officer, said in a letter to fans posted online ahead of Wednesday evening’s matchup against the Marlins.

Gottlieb said the team has been “working around the clock” to resolve technical problems that frustrated many fans’ Opening Day experience Monday. Most of the issues have already been fixed, he said.

“We apologize and thank you for your patience and continued support,” Gottlieb said in the letter.

Fed-up fans took to social media to vent their frustration over “ridiculous” lines and bottlenecks at concessions, malfunctioning ATMs and “terrible” customer service.