No invoice issued before handing over to collections.

PathCare handed us over for collections even though they have never sent us an invoice. We have requested the invoice many times to no avail. Only now after being handed over for collection have they finally managed to get an invoice to us - they still insist however that we pay for the collection. I have now done paid for both to avoid being handed over further, but the this has been a horrible experience. I have never had bad debt in my life and I was simply requesting an invoice before paying an amount over to them. I will insist that my doctors use a different pathology lab going forward. Invoice number: J***