I hope you have written proof that they received your fax, and by date and time. (Can you print out a text message?) If you don't, I encourage you to request it now, just to be covered.The contract said you could rescind by "telecopy" which I had to google to make sure that meant "fax". However, nowhere in any of the documents was there a fax number!!! I finally got one from the salesperson and faxed it to that number this afternoon, and she confirmed they got it, let's hope it was correct information.
The salesperson told me via text message that I was fine as long as the fax was received before midnight today at the fax number she gave me. And she confirmed that they received it around 4 PM. Soooo, unless she is playing games I hope I'm covered.
I once lost the ability to appeal something because the agency maintained they hadn't received my fax on time. My fax machine at the time notified me if there was any error in transmission, which it hadn't done in this instance. I never quite believed they hadn't received it - but had no proof. So now if I fax to meet an important deadline, I always request receipt acknowledgement in writing.