TL;DR

I called the customer service since there may be an error with my mobile contract start month. I asked them to share an email address with me that I can ask the same question and have our conversation recorded. They said we don’t use email as a communication channel. They said trust on our word and the phone conversation recording would always be available. 

I’m switching from another company to KPN and I want to keep my number. My current contract ends in April but I wanted to initiate the process earlier with KPN. I received an email that my contract would start at the exact date my current contract ends in April. However, when I received the sim card delivery, they also asked me to sign a digital form which showed the contract start date as February. I called the customer service to change it, and they told me that they don’t see any contract starting in February. I asked them to send me an email or share an email address with me where I can have those answers recorded. However, they said they don’t have such an email address, and they don’t have email as a communication channel. Now I’m not sure whether KPN has a good service. How would I be protected agains any misinformation?