*****- sales assistance changing contract deals

I went into a contract with Telkom in December 2017 for DELL Ispiron I5 with a wifi router with 10 GB any time and night surver data and one of the sales assistance explained to me the contract as it is advertised that I will get 10 gb anytime data and 10 GB night surfer data. There was no stock available and I received my laptop in march. In march the sales manager assistance changed the contract to 599 and I only received 5 Gb anytime and Night surfer data.The same deal was advertised in march 2018 for 499. I have phoned your head office numerous times I have email you numerous times I have contacted the manager marcus Tyatulla numerous times. the manager at the Telkom branch in Mossel bay Marcus Tyutula is avoiding me. Your head office told me that the branch has to fix the contract. I haven't been reimbursed you have deducted and you still deducting 620 and I still not receiving the data as advertised. I haven't received any statement from march from Telkom . I would not recommend Telkom to anyone you are bad service provider .