Getting rid of KPN

So, we moved and I canceled all our subscriptions at the old address. So I thought, it turns out KPN has /dev/null’d my cancellation request for the fixed line twice in a row. Each time customer relations assured me it would take 5 working days for the request to be processed. I just called them a third time now, because the line was active. The kind lady gave me a reference number for the cancellation order. So, whenever you deal with KPN I think it’s a good idea to ask for the reference number of the case or order.