I can't get 100% on the game because for some reason this side quest isn't working.
Matillda the pig of prohecy.

I have taken a drink nothing happens.
I have taken 5 drinks nothing happens Matilda just oinks at me, so I cant understand it.

I have knocked the game off and reloaded still no good.

I have Left the area done several missions and side quests still it does not change. 

I can talk to the guy and he tells me the pig is a seer.
I go back over to Matilda, the drunk next to her can understand her but i hear oinks. Tried drinking and nothing happens. Have watched youtube videos and it shows me I should be getting drunk.

What can I do as this will stop me from getting my 100% complete trophy which will be gutting considering the hours I have put into the game.

I can't get 100% on the game because for some reason this side quest isn't working.
Matillda the pig of prohecy.

I have taken a drink nothing happens.
I have taken 5 drinks nothing happens Matilda just oinks at me, so I cant understand it.

I have knocked the game off and reloaded still no good.

I have Left the area done several missions and side quests still it does not change. 

I can talk to the guy and he tells me the pig is a seer.
I go back over to Matilda, the drunk next to her can understand her but i hear oinks. Tried drinking and nothing happens. Have watched youtube videos and it shows me I should be getting drunk.

What can I do as this will stop me from getting my 100% complete trophy which will be gutting considering the hours I have put into the game.