Poor service after porting to MTN, so frustrated, my life is stuck

I'm so disappointed with the service I'm receiving from MTN I ported from Telkom to MTN on the 15th of December, till this day I'm still not receiving non-MTN SMSs. I've called their customer service multiple times, was told to google what to do. I've went to 2 of their stores and still no help, the stores don't have technicians. I'm so frustrated, my life is stuck and everyone is just clueless. MTN store at the Standard Bank centre in Pretoria is ******* and the one in Brooklyn mall, they are just clueless. Porting to this network provider was tha biggest mistake of my life