Econo Auto Service told me the price was at $150, hour and half later told he'd now charge me $240. San Bernardino California

The owner (Middle Eastern?) had told me the price was at $150 and I had already signed an invoice showing the total price. I had come back an hour and half later only to be told he'd now charge me $240. The only thing I had asked for was an oil change and a fuel filter change (all brought by me: fuel filter, oil filter, 12 qts of 15w-50). Once I disagreed and said I'd have to get the cops involved he started saying hed take out my filter. Then proceeded to go into my vehicle after it was out of his shop and open the hood. I had to bring out my phone and start recording the heated interaction just for him to go back on my original price. First brought into the shop around 230 pm pst I returned around 430 pm pst to then face with this situation.