RAIN won't change my Billing Date

I have been trying to change my billing date for 2 months. When I signed up for a new contract in March, I informed the consultant that I don't want to continue with the previous contract's billing date and she told me I cannot change it. I tried for 3 months, but the date simply does not work for me. I attempted to change it on the app 2 months ago - the option never works. I called on 14 June, I've yet to get a response on my request. The call center lines are never answered and the callback option is clearly for vibes because no one ever calls back. My last debit order did not go off and the app payment option does not work. I don't know what's going on at Rain, but what a colossal mess. Do you want to do business or what?