The call answering staff basically do a good job with occasional mistakes. When it comes to them correcting these mistakes, things get rough. Due to a poorly noted call, we contacted call acceptance and pointed out this error; it took another 2 calls to correct. We were billed for these 3 calls in total, and immediately after receiving the bill, we objected and asked for correction. This has not been done to date. And although we paid the bill of the following month very promptly (everything was OK in the following month), a collection agency contacted us very quickly and wanted to collect our debt of about 7 € - with 10 times the fees. In contact with the owner we were allowed to find out that this was not a misunderstanding, but that this clearly corresponds to the owner's ideas on how to deal with customers. In the end, we resolved the cooperation, the collection agency it was probably also too silly to argue because of 7 € + fees and the case was settled there.
Based on our experience, we must say quite clearly: NO RECOMMENDATION!
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Comment from phonea Sekretariatsservice: 
we are very sorry to hear that you have received this bad rating. Our team is always trying to answer calls in the best possible way. Unfortunately, mistakes sometimes occur in this process. In a joint dialog, we always try to work through the errors and talk directly with the colleagues. It is a pity that you did not give us the opportunity to do so.
We can only improve our quality in the long term with objective criticism and tangible information. That is the goal of every quality management system.
Kind regards from your phonea team