I agree that 3 syringes sounds like a lot of filler. It may be that you received Juvederm Volbella XC that comes in two syringe sizes - 0.55cc and 1.00cc. It would not be unusual to use a total of 1cc for both eyes if both the medial (nose side) and lateral (outer side) of both tear troughs were done. In my experience this filler lasts 12-18 months in the tear troughs, and is a good choice to use.
There are rare cases of filler disappearing within two weeks of administration. I used to think this was myth, until it happened to me with a lip filler patient. If this highly uncommon event happened to you I am so sorry, and there is nothing that you can do, other than ask for a partial refund.
The other thing I am seeing in your most recent photos is puffiness of the eyelids, and this can make the tear trough appear deeper. Swelling can occur with reduced sleep, increased salt intake and is also common after alcohol use. I wonder with the holidays that we are now just finishing if that could be a factor.
I would go back to your provider at two weeks and get their opinion. I will say the immediate post photo suggests that you had the procedure done correctly, so there is no reason here to lose confidence in your provider.
In Omaha NE most fillers are not done by plastic surgeons, but rather by MD's, PA's and NP's who dedicate their time to providing the best non-surgical solutions.
Good luck and I hope you find an explanation for what happened.