This is governed under Ontario Consumer Protection Act (CPA), where it says the merchant, including e-commerce vendors, SHOULD
acknowledge of the complaint or inqury within 7 days of receipt,
endeavor to address the complaint within 45 days of acknowledgement.
It's worth noting that the term SHOULD carries different legal implications than MUST. The use of "SHOULD" in an Act indicates a recommendation or a best practice. It is not leagally binding therefore it results neither a legal consequence nor a legal obligation.
Before the end of July, 2005, these were governed by the older version of CPA, which did not include provisions for e-commerce but the section about Service Level Agreement (SLA) says the same -- While the response time for customers' inquries about goods and service is a critical metric as far as customer satisfaction concerns, business can operate without a SLA.
I agree the customer service can be done better as pointed out by others -- probably we would also agree the same can be said for vast majority of the companies -- but the owner of Rolia did not breach the contract in this regard.
Disclaimer: During my tenure, I am forced to be specialized in Digital Privacy Act and PIPEDA with a strong focus on Software and BioTech. I also moonlight for CPA related disputes. I am likely qualified to give information more aligned with legal framework. I know neither the owner of Rolia nor the involved other party.
I have no incentive to take side. Being in this particular legal arena for many years makes my eyes itchy when I witness someone deliberately disseminates false information, such as the implication of chargeback, their claim about cyberbully and violation of privacy, their misinterpretation of business conduct and contractual obligation, and their definition of "西方规则".
What's important is, as human we should uphold ethical standards. This world is ruled by both laws and morals. The justice and fairness should be found as a "harmony between action-guiding aspirations and action-committing obligations" -- This is what the best judge is made for, this is the motto I learned from Osgoode Hall on my first day, I dare not to forget.