POSSIBLE MOBILE PHONE SCAM

Please has anyone heard of a mobile phone scam. I have been getting calls from a 63030 number which I do not answer as I am unsure, then when the ringing expires I get the missed call message. I got on to my mobile phone provider but they could not put any light on it. Googled number still nothing.

Hi if it starts with 6303 and is a very long number this is what sometimes shows if the hospital or medical centre is calling, do you have anything medical pending

Oh Gosh I didn't know that I am so grateful, yes I am expecting many a call from the hospital and I shall contact them, not sure if I can just do a call back, I shall try. Very grateful.