I apply for a spouse visa, Z visa, but I was issued a F visa, how can I do?

hi, i applied for a spouse visa on friday at china embassy in ghana.my wife is a resident in beijing and her office got me an invitation letter from the government to apply for a z visa in china embassy ghana.i have my marraige certificate, endorsed also by the foriegn ministry and the china embassy, on applying the visa at the embassy on friday, after they accepted my documents, on my pick up paper the visa category written on it is F visa, which is business visa.can someone plz help me in explaining why its like this and what i should do.some said maybe the ghana girls on the counter dont seem to understand the documents as it was written in chinese character, and it was also stated on the invitation letter that i should be given a z visa, and some said maybe the consular who is a chinese would eventually find out and give the z visa.can someone plz tell me what to do?