TWT Boksburg/MICHELIN Rivonia TYRES Poor workmanship and poor Brand

I have fiited a set of Michelin tyres on my Kombi I was charged R10.000 for 2 tyres all was fiited and nitrogen fitted at Tiger wheel and tyre Boksburg. It only lasted me 3months whereby the rear back Left new tyre burst open on the inner wall, when taken back the TWT Boksburg I was advised my claim is non in void and and they will not entertain it and so will Michelin as well who send there rep to give there report. " which they advised that the tyre ran flat for long period of time hence it burst." Lucky i was not driving with my kids nd grand kids at the time from work jy 2/5 km on the highway. My question the them was it was fitted in March 19 and burst just 3months after and who fitted the tyre, Who fitted the air/Nitriogen which they confirmed that No leaks in my rims or valves either. But they just turned and do not want to take any accountability/responsibility of the damaged tyre TWT AND Michelin I will never use them or use a Michelin branded tyre as its expensive and does not even last 2000/3000km very weak tyre indeed which was my 1st time fitting this brand on.