Coinbase just told me that I'm not eligible to purchase BTC. Is it because the price is up? Or maybe my bank is blocking it. (Wells Fargo)

In any case, a few days ago I went through all the steps to get my bank account verified (gave them my username and password) then placed an order for .5 BTC. They say it takes 4 days, but after 2, and a BTC price increase, they  canceled the order saying it was high risk. I understand it's my first order, so it may take time to built trust, so I added a credit card, verified it, verified my identity, and placed an order for .4 BTC. About a day later and another price increase, I get the same high risk cancelation. When I asked in a email for them to honor the first transaction, they replied that I was not eligible to purchase BTC but didn't state why? I've asked, and also contested the second cancelation and asked that the honor that one too, but I have yet to receive a reply.

Has any one else had similar problems with coinbase? Their fees are low and if I wasn't having issues, the transactions would be simple and user friendly. I want to do business with them. What advice can the community provide? Should I be buying from another vendor? Is Coinbase trustworthy at all?