This is exactly why I left Curve - regardless of whether a paying customer (like I was, Metal so the best part of £180 a year) or any other customer, there are some issues that should always be treated as a priority. Imagine if I was mugged and my card and phone stolen - there seems to be no way to immediately get the card stopped apart from send an email and hope, by which time my accounts could have been emptied.
I miss my Curve card but decided that the risk was too great if something did go wrong.
If you need to block your card in a hurry, in Belgium we have a service called Card Stop which is provided by Worldline and it should be working with Curve too. The conditions report that this is working with any VISA/MasterCard if we live in Belgium.
Maybe other countries do provide an alternative option in the case one of your card got stolen?
My last metal support case took about 23 days for a response (It was requesting clarification over $200 overcharged by a merchant - Yeah, I had to wear the £160ish while Curve couldn’t provide proof the merchant double charged me, and luckily the merchant admitted they overcharged me once I showed them proof. It also was displayed badly in Curve so I didn’t actually have proof there that they had overcharged me.
Curve will realise eventually that customers don’t put up with bad service.
I guess miracles can happen. Every message I send support takes weeks to be answered.