Very bad ISP don't bother yourself signing up with these people

I recharged using blue voucher only to find out they no longer accept blue voucher but they opened my internet for 4 days and then suspended the services, I'm trying to get hold of the I am unable to get through their landlines and whatsapp line seems like there's 1 person working and they only respond once and thereafter they don't respond. Qhen they make changes they don't communicate yet they have out details