I have asked Rain to kindly change my billing date from the 1st of every month to the 25th of every month but their billing department has failed to do that

I have asked Rain to kindly change my billing date from the 1st of every month to the 25th of every month but their billing department has failed to do that. Their consultants based in Cape Town and India are so *********** everytime I call their Call Centre I have to ask to be transferred to the Johannesburg Consultants at least they seem to know what they are doing. I've been with Rain 4yrs now and I wouldn't recommend them to anyone oh and their connection is trash too