I had been a customer for years without problems.

I had been a customer for years without problems.
Last purchase in January of 5 toners. Unfortunately, 4 were defective and I ask for it to be replaced. After two expeditions in which they send me wrong toner from another printer (with a time frame of 3 months) I ask for a refund but the money has never been credited to me. The emails almost never respond. To avoid !!!