Bad TeleSales

I got a call from a women who said she was calling on behalf of Day 1 Doctor and she tried to sell me a service which after I told her that I'm currently not interested on the service, then her attitude changed and it was a worse attitude I've ever got in my entire telesale's history, which then made me even be proud to cancelled the Service I had with this service provider although my cancellation was purely based on something else but after the last call I received today, I was flabbergasted so much so I can't even believe this.