Is this how teamviewer treats their customers??

So my license was coming up for renewal, and I received an email about 50% off upgrades etc..  It was exactly one day after my old license period had expired.  I checked and I had not gotten automatically rebilled for the next 12 months, and I had not received any email invoices to my account either.  So I clicked on the upgrade link in the email and followed all the prompts and spoke with a polite woman via chat and I decided to purchase a 12 month corporate license this time instead of the premium I had bought last time around.  The lady walked me through the steps, gave me a coupon code to give me the 50% off etc.. and I went ahead and pulled the trigger and upgraded my license to a corporate license for another 12 months.  I thought I was all done and good to go.  So 2 days later (yesterday, on a friday) I receive an email telling me that I had an oustanding invoice for the renewal of my subscription and that I need to pay that before I can do any upgrading to my license, and because of this refunds are being made to my account and I will have to pay the first invoice in full.  The invoice I never received!  Not only that but they completely deactivated my license and dropped me all the way back to a "free" account.  After I had already paid!  They say they are refunding my money and have deactivated my account until I pay the first invoice that I never received.  And of course they conveniently do it on a Friday afternoon knowing full well that they are completely unavailable on the weekends.  My license covers teamviewer version 9 which is what I have installed on 50+ pc's that I service.  The free version doesn't let me connect to any of them. and obviously I am not physically by each one of them to upgrade them to the latest version...hence the need for teamviewer to begin with.  So now I cannot support any of my customers all weekend long because teamviewer thinks I should have paid a different invoice than they wanted even though they got my money anyways.  Unbelievable.  I've sent an fb message, twitter message, email, etc..  I won't hear anything until after the weekend I'm sure.

I think I may need to explore some alternatives such as **Third Party Product** after this.  I always hear great things about **Third Party Product**.