for those that belong to my cash plus company they use an 0871 number last time I used it cost me £3 50 for just a couple of minutes. :'(   this is disgusting now they locked something on my account and they have asked me to ring them. Not a chance.

Decided to check out MyCashPlus (not previously heard of them).  There is a number on their website which suggests it is only for use outside of the UK.  I have just dialled it on a mobile from within the UK to be advised the office is closed, and was then presented with a menu of options.   It therefore maybe worth trying that number.

Sadly a large number of organisations feel it necessary to use these premium rate numbers.  :o

I still don't see how OP can have been charged £3.50 for a couple of minutes - I suspect the word "couple" has been used loosely - a call of between 2 and 3 minutes duration would have been about £1.75 at most, much less from a landline.