iCloud has taken over

I have an iPad & iPhone for years. iPhone 6s. Last month the iCloud semi took over my iPhone. They took my App Store, And now I seemed to have lost my texts. I person they found, can iMessage me. I’ve never used iMessage. Is there anything I can do? They want to offer me iCloud +. I want them to drop dead. iPad is a few years old but runs perfectly…..except the semi -bricking of my phone.