Poor Telesales by Telkom

I bough a promotion from Telkom which included a LTE WIFI router with double data 10 G x10 G nite and 10 G x10 G anytime . The package was advertised for R269.00 inclusive. With the activation of the sim, and amount of R269.00 was debited from my account. When I phoned the call centre, I was informed to phone in again to cap the data fixed as indicated. When I received my first invoice, I was billed R435.24 (according to me I was supposed to only pay R269.00) which I have queried telephonically with Jessica on 16 August 2018. She explained my billing to which I was not happy with. According to Jessica my next invoicing will be R359.00 and this is not what was agreed to telephonicially. I am only suppose to R269.00 per month as per the promotion. Could this please be corrected and I be refunded as per the agreement.