Fake aqua water purifier service from this phone number

I got call from this phone number 081218 71813 displayed as mibservice in Truecaller claiming to do aqua guard service, he asked 5600/- to pay for spare parts, I got this call on the same day after I booked my service request. I have received spare parts but when asked to send service person he said you need to pay extra as it costed more so I didn't pay extra.