Quoted $2500 Ends up $3960!!!!!! What do i do

[scoupedy]

My engine rebuilder has called me saying that my engine is ready, he quoted me $2500 to do the job, he was suppose to call me and check for any extras needed he did this once saying that i needed a new flex plate which was suppose to be ~$150 now he has told me that the total is $3960 and that i added balancing after which is BS as i always wanted it balanced
what do i do about this guy? :jab: