Website payment integration-no help from technical support

We have been trying to get assistance from technical support to load the payment integration onto our website since the 30th of April 2024. Our business's technician/developer has loaded everything exactly as per their videos and it is still not working. We have been trying to get assistance with this to no avail. They ask the same requirements on email and then we wait a further 4 days for a response. We have ultimately decided to go with another company as this has held back our website launch, which is resulting in financial implications. So disappointed in this company.