Debit order without permission

I received a message on the 10/10/2017 Dear Client , please note that your membership on Fusion Benefits is currently active ,Queries ********** 532 Debit Ref RNMHOLD . I emailed them , try to phone them . Numbers is not in use , tried a couple of days . today 2017-11-1 , I receive a email ..

Dear Pieter We received your email regarding the sms.A consultant from RNM HOLDINGS will contact you shortly. Warm Regards Fusion Benefits Team

I know nothing about this people and why is there a debit number ? Where did they get my details ?