Dispute not Ascalated

My dispute with Vodacom began in February upon the charges that incurred on the router which will come with 2gigs per month. They phoned me as a promotion on their part and I accepted strictly because I was using only 2gigs per month. This was last year September. In January this year, they sent me a message telling me I owe Vodacom R3 509. Now this amount includes the normal top-up flexi 350 that I have with them which comes to about R600 per month. Now with 2gigs per month the normal subscription will come to about R700 per month. Meaning therefore I was disputing about R2 700. I phoned them in February to dispute this that was February 11th. They gave me a reference number and an email and also promised me that someone will call me to tell me that my dispute has been escalated and under investigation. Here are these references: S3-8WD20-09X8H, email: [Email Removed] I did email them on the 12th February and I have it on my sent emails and the router number in question is ***. On the 8th April I received another message that I owe them R4 580. Which means they never escalated the dispute. I called them on the 10th April and spoke Nwabisa Tayika.