the reply from CIC is a standard response to inform you that your documents are in order, but not assessed yet. with 55+4=59points, it's an outright rejection. so if u can get your money back, i suggest you should asap. if you request for more time, they may not give you. they may have their own schedule. if you say you will open a shop blah blah, they won't care. they have objective requirements for skilled professionals and you have to satisfy the criteria to be considered in the skilled migrant category.
mostly, even if you rewrite IELTS now, with this anxiety, trust me you won't improve the score. you need to calm down first. be realistic and prepare for the exam. once you have enough points (>67), reapply for the immigrant visa.
asyousuf: you are misleading him. you couldn't be approved unless you scored more than 67 (seldom >66).