Free spam call blocker

No idea what it's on about, Email says I have 14 days trial with supercard as described in our phone conversation and if I want to cancel phone that 0844 number! Don't recall any phone conversation! Will delete and see what happens as it also says if I continue using supercard will automatically be charged 69. 95 pounds! They do not have my account details even though it says to 'Access your account', Nor will they get it!