Poor service with cancellation of service

I signed up with Crystalweb in Jan for a 150gb capped service for R399 believing I was only subscribing for one month. I used a few MB's from my CAP before moving to Afrihost as the download speeds I experienced with Crystal Web was awful. I was then surprised to be invoiced for R399 for the month of Feb. I immediately requested cancellation and asked if I could get a refund. I was told that as per their T's and C's that I would not receive a refund as I should have cancelled before the 18th of the month. I was upset, having to pay R800 for using a few MB's of data from Crystalweb. I honestly could not recall signing up for a recurring monthly subscription and requested proof showing where I did sign up for a recurring subscription - and haven't received anything. I signed into their portal, to verify my subscription details, but it provides no useful info about my account. I paid the outstanding amount, requested cancellation of my subscription online, and sent them Proof of payment on Feb 5. I then asked for confirmation via email that my subscription was cancelled (twice), but they are now not even responding. This is very poor service. I will never recommend them to anyone.