Jomtien insist you use their forms and handfill them. Tried v neat typed forms off their website and they sent me away to handfill their tatty photocopies! Also asked for a document list and they only had it in Thai! Not surprising I am considering changing from marriage to retirement extension with an agent when I don't have to queue at their office only providing photos passport and bankbook for their stamp. Cost is significant but how do you price in the stress of multiple visits and queuing to Immigration, Bank, Municipal Offices etc as well as a possible home visit, 30 days under consideration when HQ may and does ask for more paperwork and then a further 13 mths of collecting credit advices from BB and monitoring Jomtien's ever-changing rules.
At some point I will either get fed up working year round for Immigration or become physically incapable of attending Bank, Municipal Offices and Immigration. Roaring around Pattaya in a souped up electric wheelchair at extension time could be the answer!