Terrible service

Bad service , they request to send prove of payment i did send it but always when i contact them they claiming they didn't receive email when i asked them to give me other alternative email that I can use they said they don't have it. what kind of the business that the don't have other alternatives connections. i submitted my claim two weeks back and i have been trying to contact them last week and they said i must go inside shop to pay outstanding i did and they refused to take money and they gave me their account number but still now they cant excess their account.