POOR TYRE PERFORMANCE.

I purchased Ford Ecosport titanium on 15 Jan 2018. It's a decent car, make me a proud owner, every time I drive. But, only one big issue on same side rear left tyre. Ford was supplied with MRF Tyres. But, only on 2850 km approx, my 1st tyre got burst on a highway. MRF denied any manufacturing defect, so I got it changed by paying 50% amount from the market. I started using the stepney tyre. In mid-January 2019, only on 8700 km approx, again, that Stepney tyre got bubbled and became flat from the same place adjacent to the bubble, while driving back on NH24. Somehow, I got this fixed by a roadside mechanic. when I inspected the car, it was again flat, I got changed the remaing Stepney, which got flat on the same day. All within 8900 km of the total run. Car dealer has sent the tyres again to MRF, who have the same verdict that it's not a manufacturing defect. In this situation, how can I Afford a Ford. 3 tyres in just 1 year in for 9000 kms only. How, a tyre company, like MRF can make this useless product and why FORD is using MRF tyre as a standard fitting.