A Rainy day with Rain

Hi. I have had a Rain Internet Account for over 4 years now. My package is I have unlimited and uncapped internet except between 18:00 to 23:00. For this period I purchase additional data airtime for which I am billed at the end of the month, according to the limits I set beforehand. Their service has been great, but for over 2 month now I get no data airtime for the limited period. I have called and had no answer. I have placed several tickets, to no avail. I'm not billed for the data I don't use (As they show I have none available), but their website and online billing shows I used it. Your service used to be prompt and great, what happened?