Delaying claims purposefully.

I'm extremely dissatisfied with their service. As a healthcare provider, we have never had a good experience with the claims department. We even had to lodge a complaint with the Ombud's earlier this year to have moneys due in 2021 paid out to us. Today again, we are told that our banking details are not loaded on their system. After insisting to speak to a manager he rudely told us it is for auditing purposes and just resubmit the form. A claim was paid out last month into our account??? We are a very small practice and have expenses to cover but it seems they are just not interested in resolving issues, that should not be issues in the first place. Having our clients pay upfront to avoid this in future is also not an option as they simply do not have these funds available for treatment. From all the medical aids we've worked with over the last 5 years, we have had the worst service from Momentum Health.