Hi Shelly
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work We have heard from members on the forum about receiving text message from DWP to contact them.
You can either do nothing and wait for a letter or another call or contact ESA to see if they did send you a text message. A word of warning, there are scam messages going around so don't dial the number sent to you but contact ESA enquiry line: 0800 169 0310 and ask, best time to try and contact is first thing in the morning.
Gary