False job promise

Hi hello Peter please help me here .I don't know whether this is the right platform or not .Last year around October I applied for an internship through indeed .Got a replied by the company to come for an interview .I went there only to find out its not an interview but assessment test and they told us it is another way of recruiting because their HR was unavailable, ohk fine the following day day I got a call from them saying they are considering me for an intenship they will communication when to come and sign a contract. Got a message after two weeks I went there to sign and was suppose to start early January .come January they postponed to March. Come March March no communication from them and mind you I have rejected other offers from other companies knowing I have signed a contract with them .and unfortunately I don't have a copy of that contract they promised to sent it via email since their reception lady was busy with their copy machine .I'm worried they might register me as employed while I'm still hunting and that will close doors for other employer that might be interested to employ me .please help on what steps should I follow to expose them the name of the company is Premedata service