MTN is bad for small business

I lost my phone through hijacking in August, I've been struggling to get my number back, everytime I phone the 135 customer care I get told it will be active in 24hrs for sim-swap, I went to the stores in Mall I get told Sim-swap is only done via *135# I try it, I keep getting technical error, I phone agent via 135, they now tell me my number has been given out to someone else, cause I didn't use it for a month, when for a month I've been struggling to get it sim-swapped.... I was dialling 135 almost daily without any help, new story daily, we'll call you, our system is down, wait 24hrs. I now run the risk of loosing contacts and business I've built with this number as people can't reach me... yet the number has been RICA'd