I am so sorry to hear you had to deal with that. :[
Pet trading can be very frustrating, and it certainly doesn't help with some not so nice people trying to take advantage of new players. I'm sorry. I hope this doesn't make you want to leave though. There are sooooo many more kind and lovely people on here that greatly outweighs the mean ones, imo.
If you ever need any help or have any questions, please don't hesitate to mail or mt me! I am always up for helping, as well as a good chat...or I can even be here for lending an ear if you need to vent a bit. :]
Your pets are adorable btw! Lovely collection you have so far.