The Sim card not working

I bought a TFG sim card on the 16th of November 2023 they did Rica it in store and I was told it was gonna be active within seconds I tried to setup the APN still the Sim card does not want to dail ussds and it doesn't want to dail any number keeps telling me that there is a problem with the network it is indeed a very bad service consultants only work limited times we have no one to assist over weekend