Terrible Phillips Aveng Bottles Experience!

I bought a pack of baby bottles 2 x 125ml and 2 x 260ml for my baby she is now one month and I have only used the 125ml bottles one teat is torn and leaking and I have found that the teats hold a slug like old milk substance that can not be cleaned no matter what you try I can imagine this to be very unhealthy and dangerous for a baby. I am so disappointed in these bottles as I only used it for one month and already having so many problems and need to replace the teats already.