Before I had excelle...

Before I had excellent promt service.. However with my last international order my parcel kept returning to the warehouse hence my cell no not valid. I vomunicated over a week with Buffalo explaining my contact nr has changed I changed it on the Temu app phone Logistics constantly and only yesterday the call center made the effort helping me to change the info via email confirmation.. The question is why could they use the not make the time in the first place by assisting me sending me the email avoiding this back and forth delivery?