lied to

I went into the store shopping for a 5g phone. The guy recommends the Samsung a03s. I agree but as it was Sunday I couldn't contact Verizon to port my number. I came back next day bought the phone (a03s). I went back because i was having trouble with the 5g. They told me that the 5g is really bad in  the area, then proceed to tell me that the phone in fact is not 5g. So I am now stuck with a phone that doesn't do the only thing i wanted it to, 5g.