Retaining an attorney is your choice, but it is probably a good idea to have.an attorney handle the case. In order to prove it you will need to testify in front of a judge and tell him/her about everything. Also, if you kept phone logs of each time he called you and what he said, that would be helpful. The are many strategies to use in going about to win the case.
There are many domestic violence service providers in the twin cities who can help you with an advocate and possibly with a pro bono attorney through OFP hearings.
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