I have bought different content packs, including the Halo and Adventure Time and I want to use it with my friends but it won't let me.

When I enter a game to an online server, it tells me that I cannot enter when I could before, since update 1.13 it sends me that message:
Restricted multiplayer skin

The skin you equipped is part of a content pack that is not allowed in multiplayer games
it is translated from a literal spanish, i don't know if this message says the same in english 

If I pay for content like that, I want to use it locally and with friends, if not, I am not interested in having paid for those products with skins that are free and if you let me use them anywhere.

How is that solved or how do I refund if don't let me use it online?