Family Dollar

I was at the register when a manager stated the plastic in my purse belonged to them. I asked what are you talking about. The manager I got into the confrontation with told him I came in the store with it. So before I could check out we get to arguing and she tries to get my bag from me while I was holding my 4 month old in my arms. I almost dropped him multiple times while she continued to try to remove my bag from my person. I end up leaving my phone and they will not return it to me without continuing to be a burden and I am seeking help in this matter. I believe it happened on September 01 2019.