MOMO SCAM PLEASE BE AWARE

please be careful to these scammers. One guy came yesterday and said he's sent his money to my mom number and I have to resend it back to him. In a second, he sent me text message that I should enter my pin code. I restarted my phone and lost connection with him. Later different number called and said the guy I spoke with is a scammer and that I should give out his number to him so that they can block his number. He said he's calling from MTN Ghana. I switched my phone off because I was confused. I knew the number is not from MTN.