Raw deal not honoring consumer act

I was called by buy mondo in May to tel me as n loyal Mtn customer I qualify for a super microsoft phone for R95 n month an I requested data as well. The package arrived with 2 discontinued Lumina phones one even not on the invoice and 2 sim cards. This was not usable and I was afraid to keep both phones and wanted to return the phone not on invoice and found the phone is not what was promised. I was helped by Nick fro walmer Mtn to return the misrepresented package within 7 days and canceled the contract. After numerous visits to Mtn i am billed for the phone and data for 3 months now. I even phoned the call centre. now reply yet. Not even a reply to the mtn store in Baywest..now. I was advised today to cancel my Debitorder by the Baywest store. which I have done. my account should be in credit. yet billing continue. I was just advised that I could be stopped on my other 2 phone numbers with mtn. I should carry on paying the cancelled contract until the buy mono decide to give me credit. yet I am invoiced by Mtn...Please do not buy any promise on telly sales from Mtn. go to the store and see what you get. Mtn does not honor their prommise in terms of legislation (consumer act) if goods returned unopen within 7 days. they continue as if there is a legal contract. All advise I could get from Mtn in store is to go to the consumer protector or the ombudsman. Yet one has to pay or may be blacklisted???