Sell direct service

I have had the worst service with Sell direct since I signed up for a wifi router with 5gig day and 10gig night time. Firstly with this I found out that the agent pitched me an incorrect deal and I only got 500mb of data, I logged a query and after a long wait it was finally corrected with the reference number ********** and I was given a new option of 10gigs for R139 to correct this and this was done by Tashrieq on 19/03/2018. When my telkom bill came this month it showed that I have to pays R1906 which includes a device obligation fee of R1320. I called Telkom asking why it had an extra device obligation fee they told me it is because of this change and they will investigate further and get back to me after contacting selldirect. I tried to be proactive and called Tashrieq and he ensured me that this amount will be waived. I am now out of budget because of this and am extremely disappointed in this lack of service as I have been calling and told by a lady named Nicole that she will get Tashroeq to call me and to this day I am still waiting for this to be corrected. Please assist me.