Worst service

I received my upgrade (I phone) on the 10th, but still cant use it , my current sim card does not fir in the new phone, so i have to do a sim swap to a new sim card. I requested this sim swap Friday morning at 8:00 am after being assured that i will be contacted in 2 - 3 hours by the correct department to do it , they failed to phone me at all on Friday , then i phoned again on Saturday but nothing was done . When i phoned this morning i was informed that my request has been closed . And a new one will be opened. Now days after receiving my new phone i still can not use it because Cell C can not deliver a proper service.