How you treat an event sets the tone for everyone else. If you said not to bother coming to the civil ceremony, here they will take that quite literally as in don't bother, don't ask, don't celebrate, don't even make much acknowledgement as to it having happened. In fact telling people not to come would be offensive to a lot of people here, and therefore they may feel like well if I wasn't even invited why should I acknowledge it? I'm sorry, I know as a newbie I would have seen it the same way as you, but now after 9 years the moment I read that you told them not to go to the civil, I hate to say I immediately said, well that's why no gifts then. There was only a civil, no formal, not even a planned lunch in your house it seems or a toast? If you'd really like your husband's family to acknowledge you can still rectify this, you could invite everyone for a toast to your marriage in your home. It will be a bit odd for some locals but you could just invite everyone for 6pm ish one sunday and have a dessert and a glass of champagne. You may not receive any gifts (which sorry, sounds likely from your accounts of the Argentine family!) but you may at least receive a warmer welcome to the family.
Most weddings I've been to here there is quite a process, even if the final event is rather informal -- the card gets dropped off personally, never mailed and certainly never invited over the telephone. The engaged couple goes to the house of each invited guest and delivers the card in person. You have a mate or whatever, they leave the invite. Along with the invite is usually included the information for the gift, whether it be a bank account number for where you can deposit money or a registry list. The inviting of guests can take quite a while... we lost many weekends despite only having 50 guests. But even the events where it has literally been in the back yard of the father's house have had this formal invite process.
After the wedding people do have 1 year to give a gift as well -- that's quite common in many countries, so perhaps don't give up?
Most weddings I've been to here there is quite a process, even if the final event is rather informal -- the card gets dropped off personally, never mailed and certainly never invited over the telephone. The engaged couple goes to the house of each invited guest and delivers the card in person. You have a mate or whatever, they leave the invite. Along with the invite is usually included the information for the gift, whether it be a bank account number for where you can deposit money or a registry list. The inviting of guests can take quite a while... we lost many weekends despite only having 50 guests. But even the events where it has literally been in the back yard of the father's house have had this formal invite process.
After the wedding people do have 1 year to give a gift as well -- that's quite common in many countries, so perhaps don't give up?