Day ******* of full salary

In the month of may I received an sms saying I have almost reached 50% on my usage and not understanding the sms contents called the Vodacom call centre and a lady advised I should ignore the sms it was sent to me by mistake. A week later I received another 1 advising me that I have reached 75% usage and I called again and spoke to a lady who said who rushed me to not worry. A week later my line was locked. Yesterday they debit my whole salary for something I don't know off. I want my money back as I don't owe them such.