Indiegogo is correct. You did not purchase something from a 'seller', you donated money to a particular project. You hope to get whatever premium you are supposed to get for donating, but sometimes it is delayed and sometimes it simply doesn't happen. They aren't liable to provide you anything. That's the 'fine print' you should have read.
Pursuing a chargeback with your cc company only adds to the confusion. The dispute isn't usually directly between Indiegogo and the issuing bank - most merchants (for the purposes of this discussion Indiegogo) go through a 3rd party for chargeback disputes. The chargeback process is long and convoluted so I'm not surprised that, although your cc company says the dispute is resolved and you 'lost', it will still take weeks for that info to make it to Indiegogo.
Short answer... there is nothing you can do but wait until they take your account off hold status. Then you can contact them for status of this particular project and hope that you actually get what you wanted. Good luck.