False Advertising and unauthorized debit order

On the 15 of March I was contacted by a sales consultant from Mondo offering me a package deal of R 199.00 router and 20Gig to find that it was false advertising and incorrect information given to the .I then cancelled was given a reference number from MTN #***] on the 18/03 that the contract will be cancelled as I was instructed to destroy sim ,on the 31 March received statements adv emailed all the correspondence requesting a cancellation letter .MTN decided to debit my account on the 26 April without my concern as the contract I never accepted and false advertising .