I have court coming up for "unknowingly" driving under suspension even though I had insurance during the stop & a SR-22 bond. Need advise please

I'm confused as to what I'm supposed to do now! Should I represent myself or do I need to hire a lawyer? According to the police officer my license was coming up as "suspended". He stated that I must pay a reinstatement fee of $150. I thought that I had already paid that otherwise I wouldn't be driving. So I've been searching frantically for receipts, bank statement, etc. I went to the bmv to have them check records of payments but you have to have the exact date you made the payment. Unfortunately I don't remember what day so that didn't help me. I have insurance and all records. Now it looks like I'm facing a possible year of suspended drivers license and more which I can't afford. Single mother and have to maintain my job. I have a clean record otherwise. Any advice is greatly appreciated and please call or email me! Thank you