Why would a workplace be flip flopping my schedule around so much?

I recently started a new job at Popeyes like I mentioned. They told me to take off Saturday and Sunday which I was scheduled for. They told me to come back today, but never told me what time (which I work afternoons and evenings). I called them at 1pm to ask what time I was supposed to come in which will usually be 3 or 4. They told me I was off today to come back tomorrow at 4. This is nonsense!!! Why would they be giving a new person less hours? I told them I wanted to be full time. I'd like to know what the hell is going on

Why would a workplace be flip flopping my schedule around so much?
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