Vodacom's non existent customer service

The non existent customer service from Vodacom has left me and my partner extremely disappointed. I have a contract with Vodacom which has 2 cell phone numbers connected to it, in 2017 this problem already started where the monthly airtime that I receive on one of these numbers comes through and immediately disappears. I have gone into the Vodacom branch at Festival Mall and I have been to Vodaworld numerous times in order to find out why this happens. Each time I am told that I am subscribed to some or other service, (keep in mind that this specific number only gets used for Whatsapp and nothing else) then when I assure the people who are supposed to be helping me that I have not subscribed to anything they politely say that it is not a problem and they will remove all the subscriptions for me but unfortunately I will not be refunded the airtime... I have let this go and said thank you to them for helping each time, however we are now nearly in March of 2018 and this monthly airtime problem is still not resolved. I phoned 082111 on the 08th of February 2018 with the same problem and was again told that they will clear the subscriptions for me over the phone, I expressed my disappointment in Vodacom and asked to lay a complaint, I was told that a service request has been logged and that someone will get back to me within 7 working days. Now it is the 23rd February 2018 and I still have not received feedback. This is absolutely unacceptable and makes me wonder why I am still supporting Vodacom!! I pay my contract every month without fail and without so much as being a day late and yet the service and airtime that I was promised seems to be my problem as they do not bother getting back to their clients. I feel like Vodacom has now wasted my time, petrol AND money for the past year of going backwards and forwards with the same issue. Disappointed does not even begin to describe it...