Jio Fiber - single band router to dual band router

I have a active Jio fiber connection.The rudimentary plan commences from Rs *** for ***mbps.The company installed a single band router which has the maximum capacity to provide upto ** mbps over the wifi. When I raised a complaint regarding the same that your router are not capable enough to provide the promised haste of the orchestration, I received no solution. on the contrary, the company is installing the dual band routers for all the incipient connections which are capable of providing the promised celerity. When I asked them to supersede my router with the incipient dual band router, they relucted to do so. Infact, the engineer asked me to purchase the high end plan to get the router superseded. Already I am paying for the silver plan which is Rs. *** for ***mbps on which I dont get the wifi haste of more than **-** mbps. I simply asked them to supersede my router with the router they are installing for the incipient connection.I am paying more amount for the orchestrations in comparison to there competitors and still not getting the benefit of high speed due to the incapable router installed by them.If I want a speed of **-**mbps, the I would have chosen other operators that provide the plans at one third of the price.