Den Networks — operation is disrespectful and not returning the city cable box exchange

Address:

Khb layout, Nandini layout, 560096

The operator in my area said there is no citi cable covered in the area so he exchnged my citi box with his den box.

I was not happy with the service so paid him his month end fee and returned the den box respectfully and sincerely but on asking back my citi box he said he will give and now disrespectful when asking back the box and asking me again to pay 300 for the box.

Why should i pay 300 for my own box which i paid and brought.