Checkers Sixty60 new app

Reluctantly, I've given Checkers Sixty60 one star, where I'd love to give them zero stars (apart from there delivery people, who are great). I downloaded their app as my mother has dementia and can no longer do her own shopping. When downloading their app, I chose the Extra Savings Plus option, being a payment of R99 per month for unlimited free deliveries. After several deliveries, I noted that, not only was the subscription of R99 being deducted off my account every month, they were still charging me a R35 delivery fee each time. I have phoned them more times that I can count (over 200 minutes on my cell phone) to ATTEMPT to rectify this. Unfortunately, I have no option but to use this app to get food delivered to my 86 year old mother. This has been ongoing for 3 months now, paying the monthly subscription, as well as the delivery fee. I have been told, on no uncertain terms that, yes it's a problem from their side, however, neither the subscription fees, either/or the delivery fees will be refunded to me as their software cannot "deal with this scenario". Each time a consultant has advised me that my "issue" has been sorted out and given me a reference number in this regard. To date, and 3 months later, this has not happened. After many phone calls and discussions with consultants, with no subsequent resolution, I have requested that my complaint, and the resolution thereof, be escalated to a supervisor who will phone me back within the next 5 minutes ...... Well, 3 months, and many phone calls later, I still haven't had a call from a supervisor. If I had any other option to get groceries to my mother, that wasn't prohibitively costly, I would never use Checkers Sixty60 again. I am stressed out, disappointed in them and very, very angry