"from an unknown number". I would put a comma before "but", and the sentence also needs a full stop at the end. Also, it seems that the answer should be "Yes" not "No".
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muna tigeress No Sir, I got a call from an unknown number at 7.27 pm, but at that time I was in class.There's no need to use the 24-hour time format with am/pm.
BarbaraPA7 pm isn't 07 in any case. If you did want to use the 24-hour format, it's 07 for 7 am and 19 for 7 pm.Well spotted!