Can Shopify withhold my funds without justification?

After 5 years of being with Shopify, they decided to hold our funds due to products on our site. We removed the products and emailed that we did so. Shopify emailed us on a Saturday and now it’s wednesday and we have yet to hear back from them. I have asked several time what we need to do to get our funds, but no response. Customer Service says their hands are tied and can’t forward me to the department that emailed me. Running a small business is tough enough and especially hard without cash flow.