Find the inappropriate language in this letter. How could you re-write it using more appropriate formal language?

Just thought I'd drop you a line to tell you about a series of errors regarding my current account. This all began last week when I checked my account and was over the moon to suddenly find that I was thirty-four thousand pounds the richer.
And this wasn't just a one-off either. Future mistakes meant that by the end of that month I had over one million pounds in my account.
The bit about this that really got on my nerves was how difficult it was actually to sort this situation out with Barclays head quarters. I had to make repeated phone calls and was continually being passed from one person to another. This despite the fact that I was actually trying to resolve the problem that Barclays had created.
I can't believe it but everything still seems really up in the air at the moment and consequently I have no idea as to how much should actually be in my account at the moment.
I do hope Barclays will get their act together and sort this mess out pretty soonish.

Yours sincerely Faye Brown