Job Offer FRUSTRATED!!

I am so so frustrated and angry. Friday I interviewed for a job and it went fantastic. They even asked in the interview when I could start. Friday evening they called and said they were extremely impressed with me and would be sending me an offer. I asked if it would be Monday and they said yes probably Monday. It is now midday Tuesday and not a word. This is a small company and I don't have any email addresses but i do have cell phone #'s. Today I sent a text to both of the individuals who interviewed me on Friday to follow up and still no response. What next steps should I take? Do I consider they changed their mind? I need input I'm really angry and frustrated!!

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