CellC Petermaritsburg Midlands mall misleading custormas and giving them slow speed Mi-Fi rather than one that is advertised

Good day I would like to lay a complaint on Cellc Petermaritsburg in Midlands’s mall. I sent my wife to this Cellc outlet since it was the nearest to her because I was busy with work. She went to sing up for a contract on Thursday 21 April 2016 that is advertised on March/April 2016 catalogue on top of page 11 that is R99 per month. The package is 20GB total data per month 5GB +15GB night and Free Huawei E5573 LTE Mi-Fi wifi at a speed of 150 Mbps worth of R1499. When she arrived there she was not given what was advertised she was given a lower spec instead of (Huawei E5573 LTE Mi-Fi wifi at a speed of 150 Mbps worth of R1499.) she was given of a ZTE MF65M 3G Ufi at 21 Mbps and they said it is similar spec of what is advertised which was not true and she took it since she did not understand it. They **** saying they replaced with similar type. When I arrived home I saw it the ZTE given to her is said to be R 800 and not similar as far speed is concerned it is only 14% of the Huawei Mi-Fi that is advertised on the catalogue that will end on 1 may 2016. I brought this to my wife attention and she said we must change or cancel the contract. We went there 0n Friday 22 2016. Only one day after purchase we spoke the sales man his name Sphamandla Msomi he said he told her that it is similar. I asked what is the speed difference of between the two items he could not answer and could not give us the comparison as far as data speed is concerned. I called the manager his name is Kayshlen Govender, the manager refused to take the Mi-Fi or replace it with the one that has a same speed. He was rude he said we can go anywhere nothing will happen. He said the contract was signed already so nothing he will do. I said but it is not what is advertised, he rep**** the Mi-Fi that is advertised is discontinued. I asked why they advertise a discontinued item, there was no answer. I also ask why they not replacing it with the one of same speed there was no answer. CellC please help. Please help. I need the similar specification of what was advertised on the catalogue. That was a bad service please supply us with the same specification that was advertised we have never used this 3G ZTE we can return it. Thank you. My no. is *** They no is ***/ ***