Blue label is a horrible company

I bought a phone in December for my husband to use, at first the phone was great but after a while its either freezing or everything is just slow, we than received a message on Saturday saying thank you for your migration, there after the phone his no network, I cant do anything with it, when I try to check my airtime balance it says my Sim card has not been Rica, so from Saturday the phone has not been working till now, yet on Monday I raised a complaint with them and they mentioned that an agent will get back to me in 24 hours which never happened, this is the phone my husband uses for his business, he needs it to be working asap, no one called me regarding the issues but 2 people did call since Monday from blue label to off me another contract, when I told them please transfer me to a manager or someone who can help me they mentioned that they can't transfer not even international withing the business I must just sit back and wait until someone calls me, I paid for that phone on Monday as my debt goes out on the 15th, I don't have the airtime I am supposed to get, I just have a slow phone that I can't do anything with. I regret taking this deal as it is so expensive for a stupid ZTE phone. Please help