rshiva, the actual "text line" in Qtel page states as follows


 The cost of a Hala line is only QR50. For this you’ll get a Hala SIM card with QR25 initial airtime credit and 150 days initial validity. (30 day credit validity + 120 days reconnect period).


 It is clearly stated that it is 150 days valid and the credit validity for 30 days.