Phone blocked for ****

I honestly dont understand how a simple request to open my second simcard port ended up having MTN block my entire phone access meaning unless I'm on wifi I don't have access to my phone ..

The call Center agents I spoke to told me I need to do it myself by dialing 135# and choosing option 8 of which it was option 10 when I followed their prompts then I went in-store to try get assistance because I can't make calls from my own phone and they told me they can't do anything I must call the call center again...My does MTN then sell Dual Sim phone s when a person can't even use the feature on phones. I DEMAND MY PHONE TO BE UNLOCKED AS IM NOT CONTRACTED TO YOU I SIMPLY BOUGHT A PHONE I COULD AFFORD AND CHANGED NUMBERS COMPLETELY BECAUSE EVEN WHEN I BOUGHT IT THE SIMSWAP WASN'T AN OPTION.

I AM LIVID BECAUSE MY OWN FAMILY COULDNT REACH WHEN I HAD EXPERIENCED AN EMERGENCY IT ACTUALLY SIMPLY MEANS THAT OUT LIVES DONT MATTER BUT ONLY THE USE OF YOUR USELESS NETWORK. JUST FIX THIS!!!!