cheapest network because there is no survice incl?!

i bought 4 sim cards last week 20/07/2022 - ***+*** these two numbers i loaded R230 airtime and bought minute bundle 21/7/2022 that afternoon we cant call mtn number (call ended) phoned cell c customer care they give me steps to follow to fix it done that still same problem - phoned again they log a query said it will take 48 working hours - phoned again 26/07/2022 said that the 48 hours is not over yet must call the next day - did that they promise to call in an hour (no one called) phoned again said that they will call me before day end - 28/07/2022 called again now they tell me that they cant get hold of me told them its not possible give them a other number to call said that i must wait until they call me.. tomorrow will be a week that i have this problem