deduction of money wthout my knowledge

On wednesday 10?62015 I received my payslip as usual, I opened only to find out that metropolitan life has deducted money through my salary advice.when I call at call centre the lady waz rude n said she cant help me to cancel it or give my money instead I must fax a whole bunch of document or visit the nearest branch.when I visited the branch the receptionist said I need to go do an affidavit saying that its ***** n they hv to investigate me as if am lying and up to so far they cant refund or cancel and I do not know anything n have neverr signed with them, I did not sign anything as per them contract was signed in germiston and I stay in Pretoria.