As for your visa application this result means that you have hbv and if it is a hurdle for the visa you should probably stop it since unfortunately you can not get rid of it quickly. There is a chance that you are acute so it makes sense to check igm anyway recheck hbsag in 6 month.
This result is a typical lab mistake. It should be stated as hbsag is greater than 250 iU/ml.
Uou need to find the lab or maybe pay more to this lab so that they do dilution of the sample. 250 is maximum limit of the analyzer.