Godrej Appliances — about one of your service boy

So i have requested a online service about my refrigerator on 13th may 2020. On that day one of your service boy came and said that the refrigerator has loss of gas in it and asked for 1500 rupees to fill the gas in refrigerator the next day that is today... But the man had not come yet. He had given a number and when we called on that no that guy was saying he was not the one we are seeing for. The service boy had given a bill and i had attached it with this.
If possible then please return our money or fill the gas in our refrigerator without taking extra money from us.