Unauthorized billing

If I could give no starts I would what a terrible customer service and constant billing problems . I have been struggling for 2 months to for them to fix my billing I downgraded to a smaller package to be able to afford it better without any authorisation they upgrade my speed thus adding almost 400 to my bill without any consent now I have to struggle getting it back and its not even my fault . They keep saying they will be in touch but will never phone you back . The worst part is I can not even reverse the payment I am really disgusted with rains services . I have send so many emails and still no response and now the phone lines are down if anyone of rain sees this review can you please contact me and sort out my problem for this is a fault from your side I do not understand why the customer needs to struggle like this .