I would strongly advise the coil pack bearing in mind the mileage of the car

my point about the battery is that they fitted it after advising you that was the problem - they have mis-sold you it as that is definately not the problem. sounds like a guy taking advantage of a damsel in distress. but as you say they are unlikely to take it back now so i would be strongly insisting they solve the problem at a discounted price or you will be pulling the female card to his boss / head office. it really riles me when girls are taken advantage of.