Worst service ever

I paid R2400 for a new LTE-A router, paid R549 per month for the data, my problem with them was that at the beginning the speeds were fine, later on there were hardly enough to go on to the net. When taking this up with them they said they do not have control over the speed and i can not contact the provider directly. I canceled my subscription with Crystal Web but because this after the 18th of the month i had to pay them again to be canceled the following month. Now after the first mail i sent to them this is where they came up with the weather excuse, i do know this has an effect but for more than a month? I highly doubt it, I asked them if they cant oversee my last month's payment and cancel my subscription with immediate affect as i hardly have enough signal to to anything, no feed back no nothing, i even asked them to take it up with the provider seeing that i am not allowed to do that, still no response to this day apart from the confirmation mail that my subscription will be canceled end of the month after i had to pay for a service i do not receive. Now i am stuck with a paid up subscription for the last month that i can not use and also a R2400 router that has less meaning to me than our R200 mop. By far the worst service i have ever came across in my life. I do get the idea or at least in my case that they are there for the money only and absolutely no customer service.