Won't do, can't help attitude

I signed up on the 26 June 2015, I initially signed up for the uncapped but then started getting emails to say that our usage was too much and they where slowing is down to slow our usage. They suggested that I upgrade to a different package. I phoned 4 times to get this done, each time them telling me that it was sorted, I was trying to go up to the premium uncapped and neither time did any one bother to phone to say there was a problem. <br> Eventually today when I phoned they told me that they can't upgrade me unless I agree to forfeit my months free subscription as the premium is more than the ordinary uncapped. I asked surely they can work it out pro rata and they said no. I find this attitude frustrating and the reason I left my previous supplier. I don't see why I must loose my free month when I have now doubled the amount I am going to be paying mweb. Must I rather have gone to another supplier. Please can someone sort this out as this is unacceptable .