Customer "Don't Care"

After an issue at an ATM it has taken so many emails and calls to the 'customer service' help line that I am exasperated. Information was requested via email one bit at a time rather than all at once where one answer could have been provided. I turned to the call centre. It takes up to 20 minutes to get anyone to answer. Despite giving a 0 rating feedback on many occasions, I have never had a single call back from the bank to find out why. A truly appalling level of customer service. (Note: while writing this I finally had a call back informing me my query had been resolved)