No Comms, errors in booking appointment, couldn't even get my house valued

I was due to have a Valuation appointment on Saturday 17th October 2020 - this never transpired and I recieved little to no communication or customer service from the Branch in question. I contacted the office on September 17th and spoke to a member of staff who took the details regarding my property and booked me in with an appointment at 10:00, which I put in my phone's calendar. As I can only visit my property at the weekends due to my job elsewhere in the country I ensured I phoned well in advance to secure a valuation booking with them. As the time ticked on past 10:00 this Saturday I called the Coventry office again, to my dismay the member of staff I spoke to confirmed that my appointment did not appear to be there. They noted that they would contact the Valuer to let them know the situation and that they would call me back to discuss. Come 10:35 I had heard nothing, I assumed the Valuer was with a client, so I called back to discuss the possibility of another appointment the next weekend. I explained the situation to other member of staff and they informed me that there were no appointments available next weekend either but they would contact the Valuer to ask them to speak with me about potentially making time to see me considering the situation. I heard nothing then for the rest of the day nor through til Friday 23rd October 2020 (when I sent my formal complaint) this would have given the valuer plenty of time to contact me, apologise and see if there were any possibilities open to complete a valuation. I was incredibly disappointed by this and of course will not (and could not) go forward with a valuation or sale with them. The staff I spoke with were lovely and had excellent Customer Service, however the lack of communication from the Valuer, for me, is incredibly frustrating and an indication of their service.