Fake SMS of 4Mbps package on Mobilink Infinity

One of my friend got fake sms from someone that Mobilink infinity introduced 2Mbps and 4Mbps packages, it was quite shocking that sms had only mobilink official call center number. Nobody will take a min in thinking from where that sms was initiated. For confirmation I checked Infinity site and there was no such info .

I wonder what maximum speed a wimax provider can offer. Also I am not sure about PTCL NITRO how they claiming 9.1 Mbps.