UNAUTHORISED DEBIT GOING OFF MY ACCOUNT!!!!

I look at my bank statement and I see an amount of R99.00 debited off my account... the reference starting with LINSEN... apparently it is for Pay Soft. Just who are these people and how the hell did they get my banking details? And just what is my account being debited for??<br> <br> I try phoning their office landline which is *** and it just continuously rings... Can someone tell me just how these theives get away with this ****?