It is a common thing because live support is working/answering to questions/inquiries based on the information they get from the other team who is in charge for the issue.
Customer support staffs have to work with Non-Disclosure Agreement with their company so they are not allowed to disclose internal information to customers without permissions. Their answers sometimes are general because of NDA.
In such deposit/withdrawal issue, the one who is in charge for the issue must be the finance staff who has the access to do anything about deposit/withdrawal system. Live support cant do nothing more except giving information as what they get from the finance staff and if the issue is still not yet fixed or need more hours means that the finance staff is still working on it.
Customer staffs only can answer on behalf of responsible team with censored information so what they can say to customers is very limited. I used to work as a customer staff and I know about this procedure. Sometimes I myself felt very boring with my answer too but I can not do anything more than that.
What you did is not wrong because you are asking again after the ETA they gave before, maybe most players will do the same like what you did because they are worrying about their deposit/withdrawal which is something normal.
It is a fair concern from any user because it is related to their money.