Vodacom useless service.

Need to change our company debit order bank account. Phoned Vodacom and was told I had to go to a Store. At the store i was told that I had to notify the accounts via email. Sent email 3 April to Accounts, Customer, care and Billing. Received a receipt notification from customer care. Last night 10th April received SMS about overdue account. This morning no service, Phoned and was told to email a Lance Da Costa and this should be sorted by 10h00, email was read. Phoned again this afternoon and was told to email Linda Nshangase. Still no service. What do you have todo get people to do their Jobs. Can I sue for loss of income