I suggest you train your support staff properly.
I find it incredibly irritating when support staff ignore the question asked, and in their 'response' tell me something that I already know which bears no relation to the problem that I wanted resolved.
When told they have ignored the issue in subsequent emails, answered by different unhelpful support staff, who tell me other things that I already know, which also bear no relation to the problem. I can only assume that they haven't a clue what the problem involves, so they waffle about something not asked about!
It would be extremely refreshing to get, "I'm sorry, I don't know about that, I'll refer that to our technical staff", instead of the question being rudely ignored.
In conclusion, I have no expectation that the technical knowledge and helpfulness of support staff will ever improve.

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As the company seems so unwilling to actually resolve long-standing basic issues, from their perspective it is pointless to bother running solid customer support.
Really feel for the staff, as am sure they get untold levels of abuse from frustrated users and it is safe to assume they'll be treated horribly by Yahoo! too.