Bell Canada rDNS ptr - refusing to add

I just wanted to ask the community a question.

I have a Business static IP address with Bell Canada.

We host or own email server.

Our company just signed up for Bell DSL Business internet with a static IP.

We wanted to get them to add a PTR record (rDNS entry) in order for our mail server to properly deliver mail.

All of our other ISPs in the past have no issues with this.

Bell Canada is refusing to update the PTR as they say that "international standards so not allow customizations for PTR records on single static IP addresses". In order for them to add a PTR record, they want the customer to buy a block of 12 IP addresses.

Has anyone heard of this before?

Sounds ridiculous to me as every other ISP changes PTR records instantly upon request.

So unless I upgrade from $70/month to $1000/month, our PTR records cannot change and our emails sent from our mail server are getting hung up in most spam folders.

Any comments would be appreciated as I am considering going to other ISP like Rogers, Primus, Shaw or Teksavvy.