Text warning of suspicious withdrawal

so i get a text to my phone warning of suspicious activity on my account so i screen shot it delete it i never open that nonsense .So i go to my acvoung and 136.00 dollars WTH  was taken from SULLYSUPPLEMENTS  who are not even a company any more but amalgamated with a bunch of company's so good luck getting the money , i'm confused as how they got access i've never bought any thing from that place so time to talk to my bank