Reduced subscription disappears

I optex not take take a handset on my account and received a subscription reduction of 66.12. On my invoices of 3 March and 3 April I no linger received the reduction. I phoned and got a refe no H- X*** and was advised I woyld be contacted ib 24 hours. No feedback received in last 2 weeks. I faxed them a letter in this regard slso. Still no response. Obviously the interestz of one pensioner is not important to Vodacom.