Mobile wap using wifi

i have no credit on my pay as you go mobile phone and get a text from callcastwap to download a video it said it was free i put my home wifi on dowloaded the video i got a text saying it as charged me does the charge go on my brodband bill

Simple answer NO.
To my knowledge there is no mechanism for them to add charges to your broadband bill for something downloaded. If they work out a system for that, every hacker out there will be writing malicious code to charge you behind your back.

The text is probably just a standard part of their system setup for downloads that they can't, or didn't turn off.

i got 3 text back it said i was charged £13.50p for downloading 3 videos will that get taken off the next time i put credit on my pay as you go phone their is a phone number to call to stop the service