I'm feeling quite angry and, if honest, a little intimidated so would appreciate any advice from anyone that knows more about this than me. I'm currently very ill, suffering hugely, and have very little energy or capacity even for vital calls (context, I can't even hold phone so have it facing me on speaker iyswim).
Yesterday, I called a very large minicab company (the kind that recognises your number and auto asks if you want a car to your house now or to speak to someone, IE they have ALL my details on their system) that I've previously used a lot before ill, including for telly work, to enquire about a car for a return trip to hospital to Home Counties in London this afternoon. I explained I was in a lot of pain and very nauseous so was asking how much an exec car would be (& what their definition of an 'exec car' was as aware varies by firm). Price was eye watering and I said I'd think about it, shop around, and get back to them if wanted to book it.
For next few hours I was caught up in many exhausting (see above:/) and stressful emergency medical calls regarding the (unbelievably complex) arrangements for today and also to get stronger pain relief to be able to travel, so many calls back and forth. In the middle of one call another call came in which I presumed to be from another Doctor relevant to said complexities. I couldn't take the call as had to finish the one I was on but was super stressed as knew it was likely to be an important one and wasn't sure I'd be able to catch them when called back given how stretched they all are.
Within minutes - and whilst still on the call - texts from the missed call number started flying in. The first one was 'Hi good evening how are you'; the second was 'One of my friend give me your number'; third was 'call me when you will be'. Apart from being hugely distracting from what I was trying to discuss, was completely freaked out as keep my number very private (have previously had a stalker and when well enough to work part of what I do is am a telly presenter, a combo that has already led to 2 restraining orders).
Final text was 'I have a Mercedes Benz e class 2018 color black', which was followed by another call and by then 2 voicemails which I picked up after finished medical calls, one including my name and address. Then realised it was an individual - so NOT the firm I'd called/used before but someone the Controller I'd spoken to had passed my details on to 
. Was and remain stunned, also freaked out (see above re private number and experience of stalkers, combo of which has left me feeling hugely vulnerable, esp since live alone and don't know this man from Adam).
Surely they (the - big - minicab firm) can't do this? Am I right to presume it's a data protection breach and if so, what are the remedies?
Sorry long post but didn't want to drip feed and I am genuinely really freaked out. Any advice be much appreciated. 