KIA Motors review: unadvised customer service

I brought my car to service and when i about to pay i saw there is one item charge to my fees " to do ozone sterilizer ", which is nt necessary . But the staff did not advise, and simply add on this item without notice . when i ask them to take out this item, they said it has already done . KIA PJ RED CUBE, please ask every customer needs before simply add on services just for earning . TQ