[Resolved]  Kent RO — inferior product supplied to csd

I am a serving soldier of indian air force . I purchased a kent ro grand plus sl no kr [protected] on 08 jul 18. For installation customer care was approached . Installation was completed. But the very next day the machine gone unserviceable. Again i made a complaint. Service engineer visited on 14 jul 18 and suggested to install additional pre filter costing rs 850/_. The following need to be clearify. No.1 -is product supplied to csd is not of grade 1 quality? no.2- if the machine was faulty it would have been replaced instead of rectifying defects? no.3- if pre filter is a mandatory spares it should come as an asseccories along with machine.