Is it a violation of my Miranda rights if I ask for a public defender for a CPO hearing and was told no?

Miranda rights relate to custodial interrogation by a police agency what your really asking is if you have a right to counsel; a civil protection order is a civil proceeding and does not qualify for 6th amendment rights of counsel; If you are facing possible jail time for violating the CPO, then the 6th amendment rights kick in and your entitled to representation of counsel.