UNIFI

I have an issue with Unifi I had 3 accounts with them, one paid and I am paying 700 monthly for the other 2 accounts I am left with because this is what I can currently afford. I have been paying this account consistently yet I keep on receiving threatening texts such as this: "Our records indicate that no payment has been received for your Unifi account. You have until 15 December 2025 to either settle your account or provide proof that a payment has been made. To prevent your account from being escalated to an External Debt Collector, please urgently pay your account. " I am frustrated because I am paying and they are not allocating these payments or so it seems. I have also looked at my credit records with Transunion ,Unifi has listed me as a defaulter..How am I in default when I have been paying???