Pre recorded spam phone call @ 1:38 AM

Received a pre recorded spam phone call at 1:38 AM Monday night (or rather Tuesday morning). Phoned customer care to complain, just to receive an other pre recorded voice - asking me to phone headboffice during bussiness hours or customer care between 7am and 8 pm on weekdays or 8am -1pm on saturdays. Call ID witheld so i cant block the number. Phone calls between 11 at night and 6 in the morning reserved for emergencies ONLY!!