Of course there is a reason (or several) to the problems the OP has. Something is blowing the tubes, and the problem can be solved. The OP is describing that both buying a new tube, installing it and pumping it up is impossible to do without help, becouse of disability and lack of knowledge. The OP can not afford to keep buying new tubes and paying a bikeshop that can not find the problem. There is no mention of friends or family that can solve the problem.

The BIG problem is that it is going to take a long time for the OP to trust this bike, and sooner or later a flat is going to happen again. For this bike to be a good solution for the OP`s need of reliable transport some changes should be made. The best solution for me is not the best solution for the OP.