Keeping up with the modern generation

As an 84 year old I had to get in touch with an agent to help me with Medivault money transfer to my Wallet as I did not understand tte workings thereof.I was helped with a lot of patience until I understood the total concept. My only concern is that I sent in an instruction for a further transfer and my instruction specifically qouted an exact amount to be paid which has been ignored and now have to ask the Dentist to reimburse me.