MRF Tyres — MRF tyre not run even 20,000 KM

I have brought new four tyre for my maruti eeco model, tyre size : 155/65/R13, ZVTS type on 02/03/2017 the odometer reading was 32, 581KM, from Zion Tyres at Wellington in Nilgiris Dist Tamil Nadu. My view point is now is time as come to change tyre all four, plus I am regular checking tyre like wheel balancing & alignment etc. It's private vehicle. present reading at odometer is 52, 435 Km, hardly only 20, 000 new tyre run. So kindly inform me what is reason behind this new tyre normally it should run at least 40, 000 to 50, 000 km I am right, also visited MRF dealer shop and dicuss with him he told me that you bought cheap tyre that the reason before buying new tyre he told ZVTS its gud tyre will run appros 45, 000 KM waiting for you're golden & information reply about tyre I have faith on your branded products but this situation I never doubt on MRF tyre. Reply