Bad service and non activated sim cards

I took a contract with One2one on 24 November 2017 and I never received the sim cards as promised until I made a follow up, after which I was told that there was an error on their system but my contract was activated. I was asked to go to the nearest TFG store to buy simcards and RICA them and the consultant would call me to activate the cards. I received a call, in which I was informed that it would take about 72hrs to activate the contract. On 1 December 2017 I received an sms informing me that my contract was now activated as from 1 December 2017. But surprisingly, the One2one sim cards were still not working. On the 4 December 2017 I enquired about the non-working simcards but I was told that a request would be sent to MTN and feedback would take between 24 - 48hrs. After 48hrs I contacted One2one to follow up on the previous query but still no concrete response, except that another request would be sent to mtn and a request to connect the cards would take approximately 7 days. I indicated that I receive the statement in the middle of the month and with these 7 days I would have received my statement. I asked if I would be billed even when my cards were not activated on mtn network and the answer was "Yes!The contract has been active since 1 December 2017 " on 12 December, activation was done only on the old simcard and the data was loaded was not as per the contract (it was less) and I sent another email to one2one about the remaining simcard. I was told that an activation request had been re-escalated and I should allow a turnaround time of 5 - 7 working days for feedback. on Friday 15 Dec 2017 I received my statement and it included the monthly bill from One2one contract even though I was still waiting to get to have simcard activated and the data loaded on my number. queried this billing for no service and I received another call on 16 Dec 2017 from a consultant who said she would call on Monday 18 Dec 2017. She did call but still no data nor simcard working but the bill is here. On 19 Dec 2017 data was loaded on my old simcard but was half the data that I was entitled as per the contract but I was billed for 2Gig. The one2one simcard still not working. Why would I be billed for a full service while I only receive half the service I bought? Where has the rest of the data gone? I guess this is how one2one treat its customers and I involving myself with such a terrible service provider.