Website in general the owners usually are not the website designers.

Business Owners rely and trust the website designer. The website designer is only as good as his knowledge base from experience and know how WWW interacts with the website. What you see in not what you have or got. A websites public presence is only the surface like drop of oil 1000 gallon drum. What you see in sources code is thinner than that. Website Designers sometimes are just  a Fixer almost instant answers quick remedy (boiler-plated) that who knows how long it will last. The designer may even know that and more evil yet. More likely the real issue rooted deep in the server environment or website code. Contacting your hosting provider support will also more likely give you same boilerplate answers and ask you to upgrade maybe that will fix your issue. Today websites are in continuous attacks in so many different ways. The internet is full of communities each one is separated yet connected in unique or separate ways. Small websites don't stand a chance in a standalone environment without proper website design consultant. Not a website fixer but a Website Troubleshooter... A website designer that can understand the core essentials to website design and hosting environment.  Yes a troubleshooter can create a fix at the same time troubleshoot the real issue temporarily creating time for a long-term repair.