********** number being debited from my account

I logged a query with Vodacom because the amount on the invoices I am billed is different to the amount that is debited from my account. The query was logged on the 26 March and was given this service request no. S3-GQI3O-OE95P. I have called Vodacom three times since then to request feedback but I have not received anyfeed back. It has been 3 weeks and still no response.