Can doctors redo them if the patient is not happy with their results?

Each doctor has their own policy regarding revisions especially when it come to implants because of the cost of the implants themselves as well as operating room and anesthesia costs.  You should wait at least six months before any other surgery and I would not go any larger than what you have now.

I am sorry to hear about your dissatisfaction after breast surgery. Best for you to communicate your questions and concerns with your plastic surgeon and a calm and constructive fashion. Hopefully, working together you will be able to formulate a plan to best achieve your goals.When it comes to financial arrangements, every office policy will be different to some degree. I think that you will find that most practices, will charge patients for services related to surgery center, anesthesia services, supplies (such as breast implants etc.).  Surgeon's fees, however may be discounted or waived. I hope this helps.

should not ever be 'free' unless your doctor really did something that you clearly did not want.  How did you choose the size?  And your volume is much larger so why the dissatisfaction?   If you chose the volume to upsize, its your responsibility.  If your surgeon chose for you and guaranteed you would reach a certain volume, then it falls to your surgeon.