Refusing to cancel due to Discovery not doing their part

Here I am again having to complain about the same thing, 3 months ago I also complained, I was called promised that everything will be fixed, but yet, I am still awaiting. I now have asked to cancel my Vitality because they always have a problem of allocating my Active points correctly, then my Healthy Food Points and cash back. I am still awaiting on my points from the last week and Aug to be allocated. I have asked to rather cancel and then use that money to shop at a cheaper place, I was told YOU HAVE TO WAIT TILL END OCT!!!!! This is after 3 months of struggling having to email then and ask them to correct!!! As if it is my fault that they can't do they stuff right