Do Gaming add on does not work

I have the Do gaming add on active on my 20 gig cap account. I play online gaming through a pc as well as through a PS4. Now i've had this add on for a few months now, In December I noticed my cap was reached without me doing much browsing or downloading, However I did download some games from the playstation store. I phoned telkom logged a fault, Nothing was ever resolved. Last night I checked my cap and it said I was at 76% usage and my do gaming add on was sitting at 5.4 gig used. Once again this month I've done only general browsing on my PC but downloaded a game from PSN earlier this month. I started downloading 2 demos from the psn store. half hour later checked my usage again and it was on 98% and the do gaming was not effected and was still on 5.4gig used. I phoned telkom with no solution to my problem. SO either I want my money back for the last three months that ive paid for an add on that doesnt work or this problem needs to be ressolved. In the interim Ive had to use afrihost as a service provider as my cap is on 98%