Terminated, was not paid for last day

I had been unemployed for over a year, but working part time in a job I loved. However, making ends meet was extremely hard. My 'profession' is real estate management/maintenance construction. I finally was hired in a company that specializes in HVAC and Plumbing, but was also breaking into management/remodeling/construction. Wow, perfect right?! They assured me they were swamped, soooo busy, needed a good person, etc to answer phones, dispatch techs and do accounts payable. Someone that was organized and on top of things...great I was hired. The company was very busy..for the first two weeks. After that, I spent my time catching up on a month or more of filing, data entry, etc. I was given loads of praise that I so quickly learned their computer system, good on the phone (with NO training of HVAC and plumbing) organized, etc. The next several weeks were spent from 8 to 5, making busy work, the phones were not ringing, no business coming in, techs either not working or being sent home my 11 a.m. - then was basically told I was a sales person and had to do whatever I needed to to get the tech through the door. Cold calling past customers, etc. If I 'lost' a potential customer, was basically told each time, you just lost us $1000. Also I found out that I was being tape recorded, any internet use was being followed, my phone skills are horrible, etc etc. This was a very small office consisting of 4 people plus myself. If I talked to other co-workers, just to say hi, how was your weekend, I was told to 'do something'. My stomach was in knots every day. So on Feb 15th, just about 6 weeks at the end of the day the manager came to me and said we are very slow, I said yes we are, he said your sales are bad and just go, and we are tracking you on the internet and you were on it for 20 minutes today. I did not even have the chance to say, sorry, I can come in part time, etc. He was all over me just saying go, leave, go. Firstly, I was not hired for sales specifically and we discussed that the week before, I was not trained in handling questions about HVAC and plumbing, I was told to sell on a dont ask dont tell policy, if they asked for pricing or service call fees. So, the bottom line is, I did not receive my last days pay. Even though I worked from 8 to 5. I reopened my previous unemployment claim, am a single mother and I was assured they were stable, because we did discuss my situation (single mom, I need this job, unemployment, etc etc.) Based on this, am I or am I not entitled to that last day no matter what the reason of termination?