scam alert

so a guy was calling me this evening non-stop so when I pick the call he told me that he is a mobile money vendor and he has mistakenly sent money to my account so I should go and check my mobile money account and send the money back to him I said okay that's fine if I receive the a message I will send back your money and he said no if you don't go and check me I will report you to MTN and they block your number I said okay then report me let them block my number then he send me this message this number [PHONE]