Awful experience - the appearance of the cleft chin never changed

Last month I asked to get filler for my cleft chin. I specifically said "cleft chin." The doctor said that I needed botulinum toxin , not filler, so he gave me that instead. The appearance of the cleft chin never changed. I researched it after the appointment and every cosmetic specialist said that a cleft chin can only be fixed with filler. When I went to the follow-up consultation, they acknowledged that I need filler, but said I would have to pay hundreds of dollars for an entire syringe (in addition to the unnecessary injection which was hundreds of dollars). I shouldn't have to pay for another syringe if he gave me the wrong injection the first time... At the follow-up consultation he admitted that he DIDN'T EVEN KNOW WHAT A CLEFT CHIN WAS, but decided to inject me anyways. His inept office ignored me for months.