Three invoices for my internet and TV

I am a new customer. I joined on 22nd October, 2024. But for some reason I received 3 invoices in my email. 3 separate invoices. My monthly subscription is 55/month.  But I received 3 invoices, 40euros, 35euros and one for 55euros. Only one can show in my kpn. I tried calling twice but the person on the other side of the call said they don’t know about the other 2 invoices because only 1 shows in my kpn.But the money was deducted from my account. I refunded it. Only left for the invoice that shows in my kpn. And I got another email from kpn saying I need to pay in 5days. 
But I don’t understand how is it possible that I subscribed for 55/month and I am getting such a big bill for just 1month. 
I couldn’t get any explanation from the call center because they said they cannot see the invoices. They only see one.