Colegio Santa Maria (Colombia) interview questions

Straightforward process mostly, unfortunately wrapped up in a tacky fashion: 3 interviews performed in two days. Two of them virtual. Confusing and mixed signals: they seemed invested in the possibility of hiring me, even praising my English command and fluency. Suddenly, a day after the third interview, their HR leader a rejection email written in TWO LINES. No feedback or acknowledgement at all. Tacky manner to treat a candidate invested several days into the process, whom was treated by the interviewers as a capable and feasible option for the position.