Shocking debt collection letter

I was shocked to receive a Goldman Reeves debt collection letter from when I had replied to an online sample request on 08/08/2015!!

The reply from GR is that 'the agreement stated that after the trial period, unless you called to cancel, the manufacturer was going to bill you for the full cost of the product'. I don't remember that I'd to ring to cancel, and never received any communication to verify that I was willing to accept the products. This, I'm sure, violates our consumer rights. However, there seems to be no venue of communication with RVTL, and I absolutely resent paying £125.12 for 2 jars of cream, from which I'd not even seen any benefits.