Without my permission my boyfriend had signed me up to a site called computeach.co.uk

I received a call the next morning with a greeting from one of the computeach people and they explained that i signed up and asked what career I am interested in. I told them it was not be that signed up and I have no idea who they are. They appologized and explained and I then told them I currently webdesign/graphically and would like to learn some coding however. I let it slide because I knew it was my boyfriend who signed me up for this, so I let the guy send me an email with details.
I was immediately put off by the price of the course (£1600+).

However, today I just received a call from them in which made me angry because it’s 11am and I am at work and my phone was not on silent. They left me a voice mail and I listened to it and they told me they are emailing me about some offers by the end of this week (discounts) obviously because they want to lure me into their little computeach world (which i have read all over the internet that it’s unreliable and/or a scam).
Well I have now requested that they destroy all personal data on me as I find it quite frightening that they continue to follow up on me and persuade me to use their services. Also the fact that they personally contact me on my mobile. Remember it was not me that signed up to computeach.co.uk.
Do you think they will really destroy all details they have on me or will they still hold them somewhere in their database and sell them on to third parties etc?
Is there any legal action I can take over this? Is there a way I can actually find proof that they have destroyed all data from my request?
Hellooo???
I am currently being harassed by the guy who keeps contacting me via my mobile.. they are harassing me through email and will not stop replying every time i request they stop and get rid of my details!