Constant text messages saying I have issues with subscriptions, cloud storage, problem apps at risk

I have AVG (internet security, AVG anti-track) installed on my android phone. I am unable to resolve constant text messages telling me I am at risk, need to pay to keep a subscription (no particular subscription noted), cloud storage exceeded, risky apps - each is different.  I block numbers but the messages keep coming.  I need help figuring out how to resolve this.