The consumers’ association Consumentenbond has carried out a quick test of the tax office telephone help line and found two-thirds of its questions were wrongly or not properly answered, Nos television says on Thursday.

The organisation phoned ten call centre tax advisors and asked them each the same seven questions which became progressively more difficult.

On 15 occasions, the callers were referred to a specialist to answer the question but 12 of those questions were also answered wrongly or insufficiently, the Consumentenbond says.

People who use the telephone help line and still have doubts about the answers should write a letter to the tax office instead, the organisation says.

‘There is less chance of a mistake and you are in a better position legally,’ the organisation’s director Bart Combée told the broadcaster.

A tax office spokesman described the results of the mini-survey as ‘notable’ but said it was not able to comment further because the Consumentenbond had not given details about the questions which were asked.

Other surveys were more positive, the spokesman said.