Reliance Communications — world sim

I purchased a reliance passport or what is known as world SIM. It did not work in Korea. I lodged a complaint which was never even acknowledged apart from sending me a docket number. it failed then in China and recently in Spain. I wrote emails with same response i.e just a docket number. I escalted this to their appellate authority and they do not even acknoeledge the email. I spoke to pramod Borse who is national head of customer care and he was rude enough to bang the phone down. Emails to him went unanswered. I obviously am with a SIM which does not work and my money is down the drain. please please learn from this and avoid this product.