Pirelli Tyres cause vibration in car between 100 and 120 km/h

My Volvo was fitted 4 brand new Pirelli's. There was a vibration in the car between 100 and 120km/h. I took it to Tiger Wheel and Tyre Centurion CBD and they showed me that the tyres "bounce" slightly on the wheel balancing machine. Although it is a very slight bounce, it explains the vibration. To remediate the problem quickly, I asked TwT to fit Michilins. The vibration is gone. I sent an email to Pirelli. The reply:

Good day Sir, As outlined on our previous communication, tyres, original rims, and vehicle have not been inspected by Pirelli. Regardless of whether the inspection was done by tiger wheel and tyre, the comprehensive evaluation by manufacturer is essential for us make an informed decision as per our policies. Merely inspecting loose tyres or using third-party video evidence will not provide us with the necessary information to make an accurate determination of the alleged uniformity issues. Therefore, we kindly request your cooperation in involving us when you are ready for us to conduct a comprehensive inspection. This will ensure that we collect all relevant data and make informed decisions in accordance with our policies.