like anybody else here i give you the same advise, why bother yourself if you can buy a hala card for only 50 riyals, besides i just wonder why you don't want to give up your number and change to a new one so nobody can disturb you in the middle of the night anytime or any day.

Don't bother yourself with those kind of people who just bother some people like you.

yala change and buy new hala card, inform your co-worker that you have change your number to a new one.