Welcome to Som, spirits can be friendly spirits in their own right but when your working with one (craft and magic wise) you have to treat it with the upmost respect and make it so you're equals and not making yourself higher or lower than the spirit you are working otherwise it can come to some very nasty results. Such as the following reactions:
-The spirit won't help out or follow your commands.
-They can lie or be untruthful towards you.
-He/she/it will turn VERY aggressive towards you.
-If it comes to a certain point, the spirit can hurt you and even your family so you'll have no choice but to banish it out of the house and have some sort of protection around the house for a few days so it cannot enter and some sort of protection amulet with you, for those few days so the spirit can calm down and leave you alone (pure white salt should do, they absolutely hate the stuff).