Worse service ever!!! So Disappointed….I regret everything.

I just only need an invoice to submit to my workplace(fibre) but i cant get it until now, u have tried all communication channels but no one is coming back to me, i tried calling, lines are busy, i tried WhatsApp and no response, i have also tried emailing them directly and no response , i am beyond mad because now i will not be reimbursed at work, i regret the day i signed up with this company….. SO Disappointed!!!!! Thinking changing providers