We are not attorneys on this forum. But common sense should prevail that if you in deed signed a "general fillers" consent than it would appear as you have no case, legally. Written consents/contracts take precedence over anything verbal.
Although it is hardly ethical to switch one filler for another once a choice of filler has been established, I would recommend that you try to solve your dispute with your Surgeon prior to talking to an attorney.
If you signed a consent for filler without specifying which filler, you have consented for fillers. It would have been nice to know which filler you were receiving but that is unlikely to be considered malpractice.
Many doctors use a general consent for all fillers because there are so many options and often, we do different fillers on a patient at different times. I don't ever switch fillers on a patient without them knowing though. That's not necessarily medical malpractice, but it's unethical and bad for business.
"This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."