Not part of their tribe

I have sent a ach revoke letter, closed acct and opened new one, told them I'm only paying principal and nothing else, it's like there ignoring me, they just sent me a notice that I'm late on my last payment and I'm accruing interest daily, I don’t know what to do? They won't respond, I also told them I'm not part of their tribe nor do I reside on there land, so there laws don't abide to me and that I'd only pay principal and nothing else, I've sent it 2x to them and have gotten nothing, no calls or emails, just that late notice?? What should I do?