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I can't look into it for you, nor can I find anyone who can. I'm only a customer, like you.
But, being that Gen5 is what's available now and that they don't look to be offering Gen4 plans anymore, it's more than likely that the only option you are going to have is to either stay with what you presently have or upgrade to Gen5. This is only an assumption, but I would be willing to bet that this is the case. I do see that @C0RR0SIVE mentioned something along those lines, too.
I don't believe you are being singled out for this, but that this is the case with anyone that presently has a Gen4 plan.
Also, when you upgrade to Gen5 it's a twenty four month, not twelve month, contract.