Actually, if you owe something in February 2020, then you still need to pay.
I was in the same boat, paying in November and February each year. I had to make my November 2019 and February 2020 payments now to get in compliance for the new fee payment.
This is because with the old fee style, you paid at the end, while the new is pay up front. So if you might owe anything up to June of this year, you need to pay.
Once I paid I stopped getting the notices.
Michael Brown, CISSP, HCISPP, CISA, CISM, CGEIT, CRISC, CDPSE, GSLC, GSTRT, ISSA Fellow