No assistance, no customer service, no replies and wrongly dates

Assisted passenger declined help by stewardess to put handheld in overhead compartment. No explanation on how assisted Travellers are handled causing stress at Frankfurt and no assistance on arrival at Toulouse. The passenger my 87 year old mother had to disembark, fetch a trolley, find luggage and push trolley through passport to exit without assistance. When we tried 3 times to log a complaint, references were given and acknowledgment of mail being received but NEVER a response. When we tried phoning before the return trip, NO customer service is available and the complaint supposedly only gets responded to after final leg? *** the problems exist during the first to legs and concerns for assistance during last 2. Up till now 13 days after last leg, absolutely NO response. Flight delays and eventual cancelations with mails sent by Lufthansa to say "flight cancelled... new flight" and then date the flight the day before. Then eventually 2 new boarding cards... with last leg happening first and second last leg happening the day after landing at the destination... again ***... how can their technology mess up so badly... are the same computers on the planes? So if you have any "assisted" requirements, for disability, age or unaccompanied children.... I would NOT use Lufthansa again. Shocking service and unhelpful call desk, no superiors, no supervisors and no concern... by that stage you have paid your money!