I purchased Matrix SIM for my US visit, and Matrix executive communicated that your calls to US/Canada and 1500 minutes to India will be free with Rs. 5999 plan.
They raise first invoice when I was in US of Rs. 9K+ and charged my card. Second invoice was of Rs. 18K+, which they kept trying to charge to my credit card. But, luckily my card had limit of Rs. 10K only and they failed to charge that huge bill amount.
I tried reaching the executive who sold me Matrix SIM without any luck, even wrote emails to their support and answer from them was not satisfactory.
Now after 2 months, their executive called me asking for payment. I asked them to tell me a reasonable amount that I can pay and settle the bill. They keep saying the invoice is correct and I have to pay full amount. Not sure where to go ahead from here. But, at least I can post it around internet and save others by opting for alternatives.