Bad MTN service SHELLY Centre

On Saturday 14th cellphone was ****** and reported to Shelly Centre Mtn store. They did a sim swap and promised after 24hrs this will be fine and activated. On Monday 16th April phone was still not working and I had to go back to the store. They then said it wasnt done on the 14th and it will be fine within hours. This still didnt happen. I phone the call centre on the 15th and they informed that it wasnt done. Today I had to go back after speaking to Pat Naidoo at the call centre who asked me to go back to the store. I went back again today and was promised that within 5 hours the phone will be fine. I AM STILL WITHOUT A PHONE. MTN SERVICE IS VERY BAD. WILL SOMEBODY ASSIST OR SHOULD I CHANGE TO VODACOM AS THEY SEEM VERY COMPETENT.