Fido review: sim

I changed my Fido sim thrice in 4 months because I couldnt hear the other person kn the line after 10 minutes of talking.
This happens everytime.
I dont get connected to the customer service number from my phone.
When I went to the store to enquire about this the representative told me he cabt help I have to make the call to customer service.
I called the customer service and at the end he changed up on me. This is my first problem.
Second, when I told about this to the representative at the store, he was just shaking it off as if this isnt his problem. I was helpless and frustrated after waiting for 1 hour.
I am changing my sim to another network because everytime I go to the store I have a very bad experiance.
Today i went and talked to the another representative about this, and he humiliated me in front of everyone. Whatever I said he had another excuse to tell and get over with it.
I am so disappointed with fido network.