For what its worth, I cancelled my Live Update subscription and got a full refund. Interestingly, the text below is from an e-mail I had from Mazda UK customer services in September 2016. The underlined part is the interesting bit... I've e-mailed them for an update on this, but I genuinely believe that they haven't a clue as to what they are doing or saying?
Thank you for your emails. I am sorry no there was no response to the email of 16 September.
I apologise the issue with the wifi hotspot connection is still ongoing, I can appreciate this must be frustrating. Considering the difficulties caused I can reimburse the cost of the 3 years live services. Please kindly send a copy of the invoice for the purchase to the above email address, along with the bank account number and sort code we can make payment to.
Please be assured we have taken on board the issues raised. We are currently working on a software update which will mean traffic updates are available via MZD without the use of a wifi hotspot. We are expecting to see this update around the end of October.
Alan