MRF Tyres — Air fault

Dear sir I bought mrf tyre from varsha tyres authorised dealers from mrf is in perambakkam, thiruvallur dist .am having 12 tyre 10 lorry still am using mrf tyres but now unstaisfied the company want to take immediate action. I bought 4 tyres for my innova car I just used only 4000 kilometer one tyre got air bubbles.I sent for varanty the sevice engineer called me and asked about the tyre details I explained it.another day I got call from sevice engineer he called u put one pancher so only the tyre get air fault.I asked to sevice engineer I put pancher in middle of the tyre the fault is happen in side of the tyre in another side.the sevice engineer gave explain ation if mrf tyres got puncher means tyres got air fault .what is this mrf is selling rubber tyre only not a iron or any other material cotted tyres.I have bad experience .still I dind get back the tyre is showroom.very wast experience.if any doubt call [protected].