I keep getting only 12 days on my S2 visa

I have been in China since the outbreak and I have been receiving T visas with a duration for only 160 RMB. But recently they changed it to S2 visas and since then I have been getting 12 days on my visa for 956 RMB and it isn't a one time thing. Other people that have received this visa has the duration of 30 days, when my girlfriend asked about it they said that it was because America has been doing the same to Chinese citizens in America so this is payback, what are my options, I can keep paying for this visa and I need to say it china until November so me and my girlfriend can marry. Thank you for any help.