How can i cancel my KPN contract?

I am a KPN customer. In 2023, I signed up for three cell phone lines and Wi-Fi for my apartment. In December 2025, I notified you that I was moving to a new apartment in March 2026 Since then, I have had nothing but problems and inconveniences with your company. I have tried to cancel several times  After trying to set up service at the new address, it wasn't possible—the technical support is terrible—and I've been trying to cancel the contract since April 2026. I'm not willing to pay any more bills. I want a solution immediately. And I want to cancel everything with this company.