Hi
@AllyBee
I am very sorry to hear of your disastrous introduction to scuba diving. Unfortunately you have fallen foul of something that is a little prevalent in the diving industry, which is that a lot of dive shops will be running their classes in such a way as to absolutely minimise their costs. While it's fairly normal for people to learn to dive in the Uk in a drysuit, for the shop to not do any pool sessions is in my opinion not only a dis-service to you, but downright dangerous.
Having buoyancy issues on early dives is not unusual. You are likely to have been subconciously holding your breath, or at least not fully emptying your lungs. However to then turn around and tell you that it's your fault is unforgivable.
My advice would be to take whatever you can from them in terms of refund, and then do some research into the best place to take further training. Since you live in spain, I wouldn't come back to the UK for initial training. While there is some incredible diving in the UK, it's not a particularly great place to learn initial scuba diving outside of a couple of months in the summer, due to weather and temperature. If you want to learn in english, then I can recommend travelling to Malta for training.
And if you were interested in GUE's initial dive training, then I am happy to chat.
Thanks
John