Shocking Customer Service

I signed up with one plan about a year ago, from then till now. I have had non stop problems with them. Customer Services is shocking they don't get back to you when something is wrong, E.G= Sent my invoice through via email, i have not received my money back after a week. They told me that there was no attachment. But nobody gets back to me. Took about 6 weeks to get the one plan card.