persistent poor service

i decided to out a Contract with vodacom on 08/11/19, since i had been using them since 2006. cellphone arrived late, nevertheless it arrived. on 14/11/19 i started receiving " credit limit bar has been activated" smses, of which Ive logging the same issue till today 19/11/19 and it hasnt been resolved. the iphone Xr which i received on 15/11/19 doesnt pick up sim cards, ive tested it on different networks. i then visited a nearby store and the consultant advised the sim needs to be activated and they wont to that because i made my purchase on line so they dont do online purchased item queries. im very unhappy and tomorrow i will call and make use of the 14day review period and return the device im very much disappointed with the manner which ive been treated over the past week and i will settle my data contract before the end of the week and port to another network before the end of the month