Bad customer experience

I want to cancel their vitaltiy special on the holiday offer. I call the number, enter my ID number and cannot get the OTP number they are requesting me to put in on their line as the SMS does not come through while on calls. I cannot find a direct line ALL I WANT IS TO CANCEL THIS **** OF A BENEFIT BEFORE THEY START TO DEDUCT. IT SHOULD NOT BE THIS HARD TO CONTACT YOUR CLIENTS!!! FFS!!!!