Instruct: Classify the given review into positive or negative sentiment.
Query: Poor Quality after 4 months

When I first purchased this phone and the two additional 2420 extensions I thought it was great! No phone outlet for extensions, no problem. Then four months later, the sound quality started to fail, then the LCD display quit working on not ONE, not TWO, but ALL THREE phones!When I called CS they informed me I would have to mail all three back to them (at my cost) and they would e-mail me further instructions within 24 hours . . . well, that was weeks ago!