Don't phone them yet, email them (not using the faulty contact form on their website) so you have a record and ask them to itemise the period (to and from dates) in question and list the returned items with the reason you gave on your return form (I have a hunch that they don't record this info). Suggest that they exclude any orders cancelled under the Distance Selling Regs (as this is a statutory right not bestowed by them). Also suggest they then discount all items where you ticked "doesn't fit" or ""didn't meet expectations", or "received faulty" or "wrong item"...basically they should tell you the preriod of time monitored and that the only returns that should be included for the purposes of this telling off are those where you ticked "changed my mind" ...everything else is a perfectly legitimate reason for return which they have the power to reduce in future by (A) more acurately describing/giving actaully measurements and (B) not over-selling by suggesting viewers buy more than one, buy it cos it's selling fast and then decide whether or not to keep it.
I'd stress that you do this in writing and ask for the breakdown you've requested in writing and a week to peruse them before you're prepared to discuss the matter. Once you're on the phone they just want you to promise to do better or face the closure of your account. If they do this ask them how long your account will be monitored in the future.
Proud to say I was the first person to post about "The Letter" many years ago.
Jude xx
Or you could just shrug, and admit you've been caught bang to rights. The Green Seasons pack of 12 burgers with one returned, and even that one had a bite mark, the Thorntons 3kg supersize box with only the montelimar left, the Spanx with the skid marks..... We've all done it Hun and you've been rumbled :0)