Very Disappointed in the Quality

I am very disappointed in the quality of these bottles. I have a 6 week old who would not latch to my nipple and so I have to express and feed through the bottle. I had tommee tippee bottles that I used first and my baby seemed to like these so I went out and bought more. After just 3/4 weeks of using these the writing has started coming off and I cannot see the ml measurements that I need to use. I have to supplement my breast milk with 20/30ml formula but now i'm struggling to measure this using the writing on the bottle which is extremely disappointing as these are very expensive bottles and my baby only takes to these teats. Paying what we do for these bottles one would expect the materials used to make these bottles would be of a good quality to warrant charging what you do. Now I have to use a teas**** to measure because I cannot see the correct ml anymore. I do not scrub the outside of the bottle only a warm wash with some soap so this does not make any sense.