Discount withdrawn without notice

Despite the fact that my reward level was unchanged, FNBConnect withdrew the 100% discount being given on uncapped ADSL without any prior email advice and then charged my account R199. I now wish to withdraw from their uncapped ADSL and have my R199 refunded. Repeated calls to FNB Connect get a vague answer about it being referred within the organisation. The whole experience really dents my opinion of FNB and is unworthy of this usually excellent organisation.