A32 phone not working

I just got my new Samsung A32 about a month ago. I have to restart it everyday between 4 and 10 times sometimes because it keeps on saying my sim is not available. My internet signal keeps freezing and then I have to switch off my mobile data and put it back on before it works again, making it difficult for people to reach me. I called Vodacom in Bloemfontein in the Waterfront a few times and no one calls me back. Today my phone's screen is getting darker and making flashing lights. It won't charge and I'm done struggling.