Bad client service

Voice and Voice & Data, Lydenburg, Marinda instructes us to cancell our contract due to the fact that there was no internet for 2 weeks, no info from them, rather a snotty attitude towards clients, so i gave a bad review on fb, which we the was instructed to cancel the account, nd now still we get a invoice stating we are behind, so they cant even cancel the contract and when you leave comment on the fb page it gets deleted, they only keep the good ones there, who can i talk to about this people not doing their jobs?