Cannon Safe SGD57 Silica Gel Dehumidifer

Had these for six months and worked well. However, no matter how long I now leave it in the oven at the stated temperature, the beads change from blue to pink (needs to be recharged again) before the cans are cool enough to handle. Contacted the manufacturer who said they were faulty and were happy to replace, but won’t ship outside of the USA. Don’t seem to be able to contact the Amazon seller either despite them having a 12 month warranty. Wasted money from my point of view.